Bundesliga Transfers 2026/27: Biggest Deals, Winners & Losers
Published on 02.09.2026 in Football
Bundesliga Transfers 2026/27: The Biggest Signings and Most Expensive Deals
The Bundesliga summer transfer window for 2026/27 has closed and has already produced some exciting moves. While some clubs have strengthened their squads in targeted fashion, others have had to part with important players or make do with relatively few new signings.
Among the most active clubs were FC Bayern Munich and Borussia Dortmund. Bayer 04 Leverkusen also attracted attention with the return of Moussa Diaby. RB Leipzig, meanwhile, opted for a mixture of new players and familiar faces.
But which transfers were particularly important? Which clubs impressed in the transfer market? And who could ultimately emerge as winners or losers of the transfer window?
The Most Expensive Bundesliga Transfers
Once again, Bundesliga clubs spent millions on new players this summer. The focus is not just on the biggest names, but above all on whether the new signings can justify their transfer fees.
One example is Borussia Dortmund. BVB signed Dutch international Joey Veerman from PSV Eindhoven. According to media reports, the transfer fee was around €22 million. The 27-year-old is expected to bring greater creativity and control to Dortmund’s midfield.
Giannis Konstantelias also joined Borussia Dortmund this summer. The attacking player moved from PAOK Thessaloniki and signed a contract until 2033.
Bayer Leverkusen also invested in a familiar name. Moussa Diaby is returning to the Werkself after several years abroad. The transfer fee is reportedly just below or around €30 million.
RB Leipzig also made major transfers while generating substantial income at the same time. The departure of Yan Diomande to Real Madrid in particular made headlines. With a fixed transfer fee of €125 million, Diomande was the most expensive sale of the summer by a Bundesliga club.
| Player | Club | To | Transfer fee |
|---|---|---|---|
| Yan Diamonde | RB Leipzig | Real Madrid | €125m |
| Nathaniel Brown | Eintracht Frankfurt | Bayern Munich | €55m |
| Ismael Saibari | PSV Eindhoven | Bayern Munich | €50m |
| Konstantinos Karetsas | KRC Genk | Borussia Dortmund | €30m |
| Alfonso Moreira | Olympique Lyon | Bayer Leverkusen | €29.5m |
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Bayern Munich Strengthen the Squad with a Targeted Approach
FC Bayern Munich entered the transfer window as reigning champions and made several changes to the squad.
Ismael Saibari from PSV Eindhoven and Nathaniel Brown from Eintracht Frankfurt joined Munich as two promising additions. At the same time, several loan players were made permanent, while other professionals left the club.
It will be particularly interesting to see what role the two new arrivals can play in the long term. Saibari brings pace and technical quality and could give the attack additional options. Brown should also add greater depth to the squad and provide another option for the season. Anyone keen to keep a close eye on Bayern in the coming Bundesliga matches can also check the latest odds at MERKUR BETS .
Dortmund Focus on Quality and Young Talent
Borussia Dortmund have also made several interesting decisions in the transfer market.
Joey Veerman provides experience in midfield. At the same time, BVB are banking on significant attacking potential with Konstantelias and the young Konstantinos Karetsas.
However, Konstantelias’ serious injury created an additional need for action shortly before the end of the transfer window. On Deadline Day, Dortmund reacted by bringing in Ethan Nwaneri from Arsenal on a season-long loan. The 19-year-old can play in attacking midfield and on the wings and is expected to provide additional options during Konstantelias’ several-month absence.
The transfer strategy therefore fits Dortmund’s approach: the squad is to be strengthened immediately, while the club also wants to continue developing young players.
The start of the season has already shown some positive signs. Dortmund won 2-0 against Hamburger SV. However, Konstantelias’ serious injury was a major setback, with the player set to be out for several months.
Leverkusen Make Headlines with Diaby Return
One of the most interesting transfers of the summer is Moussa Diaby’s return to Bayer 04 Leverkusen.
The Frenchman previously played for the Werkself from 2019 to 2023. During that time, he made 172 appearances, scored 49 goals and provided 47 assists. He then moved first to Aston Villa and later to Saudi Arabia.
The 27-year-old is now returning to Leverkusen and is expected to help the team with his experience and pace.
For Bayer, however, the transfer also comes with expectations. After several changes to the squad, it remains to be seen how quickly Diaby can once again become an important part of the team.
RB Leipzig Rely on Returning Players
RB Leipzig have also made headlines during this transfer window.
The return of Christopher Nkunku is particularly notable. The Frenchman has returned to Leipzig on loan from AC Milan. The Bundesliga club also have an option to buy.
The transfer is particularly interesting for Leipzig because Nkunku already knows the club and previously played an important role there. Leipzig also strengthened their attack on Deadline Day by signing Marc Guiu permanently from Chelsea. The 20-year-old Spanish striker signed a contract until 2031. The transfer fee is reportedly around €16–17 million.
At the same time, Leipzig had to part with Yan Diomande, who was regarded as a major talent for the future. According to reports, his move to Real Madrid brought the club around €125 million. Overall, Leipzig generated more than €170 million in transfer income this summer.
The Best Transfer of the Summer?
There is, of course, no definitive answer to this question yet. The new signings still have to prove themselves over the course of a full season.
Even so, there are several candidates.
Moussa Diaby could become particularly important for Bayer Leverkusen because he already knows the club and was successful there in the past. Joey Veerman could add further creativity to Dortmund’s central midfield. Ismael Saibari has also already shown at Bayern that he can pose an attacking threat.
Which of these players ultimately proves to be the best signing is likely to become clear only as the season progresses.
The Bundesliga’s Biggest Transfer Earnings
Not all Bundesliga clubs invested the same amount this summer. While some clubs spent large sums on new players, others generated a significant transfer surplus through player sales. RB Leipzig in particular benefited from several lucrative departures and are clearly leading the Bundesliga in terms of transfer balance.
The five clubs with the biggest transfer surplus in the 2026/27 season are:
1. RB Leipzig: +€124.25 million
Leipzig generated around €172.75 million from transfers while spending approximately €48.50 million on new players. The sale of Yan Diomande to Real Madrid alone brought in €125 million.
2. Eintracht Frankfurt: +€50.20 million
Frankfurt generated around €78 million in transfer income and invested approximately €27.80 million in new players. The sale of Nathaniel Brown to Bayern was their biggest individual deal to date.
3. Werder Bremen: +€33.40 million
Werder also focused more on income than major investment. Around €40.50 million in income compares with just €7.10 million in expenditure.
4. Bayer 04 Leverkusen: +€20.85 million
Leverkusen also have a positive transfer balance despite their own sizeable investments. The club generated around €119.85 million and spent approximately €99 million on new players.
5. Borussia Mönchengladbach: +€16.25 million
Gladbach complete the top five. The club generated €32.25 million in income and invested €16 million in new players.
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Which Transfers Could Decide the Season?
The transfer window is over, but the real assessment is only just beginning.
At Bayern, it will be interesting to see what role Saibari and Brown can take on in the long term. Dortmund must show whether Veerman can bring the desired stability to midfield and how Konstantelias’ absence can be compensated for.
At Leverkusen, attention is focused particularly on Diaby. Can the Frenchman build on his successful spell with the Werkself?
Nkunku could also become a decisive factor for Leipzig.
These transfers could therefore have a major impact on the 2026/27 Bundesliga season.
What Will Remain from the Transfer Window?
The 2026/27 Bundesliga transfer window has once again shown that clubs can take very different approaches.
Bayern Munich strengthened their title-winning squad with young players, Dortmund opted for a mixture of experience and talent, and Leverkusen brought back a familiar face in Moussa Diaby.
RB Leipzig, meanwhile, have shown through Nkunku’s return and high transfer income that sporting and financial objectives can be combined.
Which transfers actually prove successful will only be decided on the pitch.
The season also remains exciting for football fans following the development of the teams and making their own assessments. The MERKUR BETS blog posts regularly provide new information on Bundesliga matchdays, predictions and other sports topics.
Conclusion
The Bundesliga summer transfer window for 2026/27 was marked by several interesting moves. Bayern Munich, Borussia Dortmund, Bayer Leverkusen and RB Leipzig were particularly prominent.
Among the most expensive signings were Nathaniel Brown and Ismael Saibari. The deals for Konstantinos Karetsas, Afonso Moreira and Giannis Konstantelias also rank among the larger investments.
The returns of Moussa Diaby to Leverkusen and Christopher Nkunku to RB Leipzig have also attracted particular attention.
It remains unclear which transfer will ultimately be regarded as the best move of the summer. Only the coming weeks and months will show which new signings have the greatest impact on the 2026/27 Bundesliga season.
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FAQ: Bundesliga Transfer Window 2026/27
Which were the most expensive Bundesliga transfers?
The most expensive transfers currently include Nathaniel Brown and Ismael Saibari at around €50 million each, as well as Konstantinos Karetsas, Afonso Moreira and Giannis Konstantelias.
Which transfer was the most interesting?
The returns of Moussa Diaby to Leverkusen and Christopher Nkunku to Leipzig have attracted particular attention.
Who recruited best?
A final assessment is not yet possible. However, Bayern Munich, Borussia Dortmund and Bayer Leverkusen have made particularly interesting transfer decisions.
Which transfer could prove to be the best of the summer?
Moussa Diaby’s return to Leverkusen, Joey Veerman at Dortmund and Ismael Saibari at Bayern are among the most interesting candidates.
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