Returning from a global journey, the French winger discovers a transformed club fueled by championship grit and a personal evolution that prioritizes defensive discipline alongside his trademark pace.
Moussa Diaby has been back at Bayer Leverkusen for only four weeks, but the French winger has already noticed that the club he returned to is not quite the same one he left.
The 27-year-old returned this summer in a €28 million move from Al-Ittihad, bringing an end to a spell away from the Bundesliga that also included a season at Aston Villa. Four competitive appearances into his second spell at Leverkusen, Diaby is still building towards full fitness, but the adjustment itself has been relatively straightforward.
That is largely down to familiarity. Diaby spent four years at Die Werkself before leaving in 2023 and still regards the club as home. He knows the stadium, the city, the supporters and the infrastructure, while several familiar faces remain within the squad.
The bigger difference, in his view, is the mentality surrounding the team.
Leverkusen have changed their position in German football since Diaby left. The Bundesliga title in 2024 gave the club tangible proof that its ambitions could be turned into results, while the experience of competing at the top has raised expectations around the team.
Diaby believes that he has left the German club with a greater sense of competitiveness and a stronger belief that it belongs among the leading clubs in the country.
"Leverkusen has changed its mentality,"
It is a significant observation from a player who knew the club before that transformation. When Diaby left, Leverkusen were already capable of producing attractive football and competing near the top of the Bundesliga. He has returned to a side with the added experience of having actually won the title.
His own return has been warmly received. Around 30,000 supporters chanted his name, providing an immediate reminder of the relationship Diaby built during his first spell. He appreciated the reception but also stressed that the connection works both ways: the supporters have welcomed him back, and he now has to give them performances worthy of that response.
That process is still underway.
Diaby has made a promising start but does not believe he is operating at full capacity. He estimates that he is currently around 70 percent, having felt closer to 60 percent during the match against Augsburg. The international break therefore arrives at a useful point in his return, giving him additional time to improve his fitness without the pressure of another immediate competitive fixture.
There has also been a noticeable change in his game away from the ball.
During his first spell, Diaby was primarily associated with his pace, direct running and attacking threat. Now he is placing greater emphasis on defensive work and tracking back, something he acknowledges was not a priority when he was younger. His years away from Leverkusen have brought more experience and, in his own assessment, a better understanding of what is required from an attacking player in a competitive team.
That evolution could make his return more valuable than simply adding another familiar attacking option.
The Werkself already know what Diaby can offer with the ball. What they are getting now is a player who believes he has developed beyond the version that left three years ago.
The club has moved forward in his absence. Diaby believes he has as well. His return now provides an opportunity to see whether those two developments can fit together.
