Donnarumma is a 10 year veteran who was good enough to start at 16 for one of the biggest clubs in Italy, has won multiple league titles, Champions League and has 76 caps for Italy at the age of 26. Lammens has played one season in the Belgian league at the age of 23.
Not sure I would expect him to be able to walk into the starting GK role at the most difficult club to succeed at. De Gea barely survived it when he came up and the set up at United back then was 100x better than what it is now.
Not sure I would expect him to be able to walk into the starting GK role at the most difficult club to succeed at. De Gea barely survived it when he came up and the set up at United back then was 100x better than what it is now.