Goalkeeper Wojciech Szczesny says his spell in Italy has helped him to improve from a technical point of view.
The Poland international says at Arsenal matches are prepared by focusing exclusively on the physical aspect of the game, neglecting the strengths and weaknesses of the opposition.
"At Arsenal you'd just prepare physically for it but here you watch films analysing a specific opponent before the game and afterwards we'll watch again to see what worked and what didn't," he said.
"I enjoyed working with some great coaches at Arsenal, Roma and here, but the goalkeeping school in Italy is very different – it's very technical and pays more attention to the details."
The 27-year-old is the second player to criticise Arsenal's slack preparation for big games after Cesc Fabregas in 2010.
"Here [with the Spanish national team] they give us much more information than they do at Arsenal, definitely," Fabregas told the BBC.
"At Arsenal we don't really look at anything from the other team, we look for ourselves and that's it.
"Here, maybe two three days before the game, we start looking at some videos, we know more or less the starting eleven that is going to play ... we know nearly everything about them."
