Not only Roma's mentality in europe. Fonseca can't perform in a big match. Roma has by far the worst record against top teams in the league than any of the top 8. Their tactics work against small teams they are supposed to beat, none else.
Onion fans said the same, a lot were against signing him, calling him old and washed up, bet they're kissing his wrinkled feet right now. Nothing new of course, because ageism is a real thing over here, makes me laugh when you get sky pundits and what not undermining someone like lewandowski and branding him finished.