In Italy. In the Premier League he was awful.
Mentioned this in another thread! Salah has looked very good in Seria A, but there's numerous players who've thrived there and flopped here.
You've got the likes Obiang, Cuadrado, Jovetic and Balotteli; not to mention their own notrious Aquilani! Look at our own Deulofeu prospering there!
The fact that he's already had a chance in the PL and success didn't materialise adds weight to this, although they'll blame José for that of course.
He may succeed under Klopp or when given a chance which he didn't appear to get at Chelsea, hopefully however he will be another flop.