Galatasaray might win the match but qualifying to the next round is still a big challenge to them because of their defeat away from home with three goals which seems very hard to score.
AZ Alkmaar was stronger than Galatasaray in the first leg and I still believe that those same players are the ones going to play the match. This might not make any difference in Galatasaray performance but with Osimhen presence, we might see a little difference.
Galatasaray's defeat in the first leg was quite big. It will be difficult to catch up on the goal difference in the second leg. Even with Osimhen in the team, their chances of qualifying are indeed small. Unless AZ really plays badly without tactics, and that allows Galatasaray to score a lot of goals. But we know that's not possible. AZ being able to win in the first leg is clearly a confidence booster for them in the second leg. I think even if Galatasaray wins, they won't make a big goal difference.