Jack Grealish says one of his Manchester City teammates is the toughest player he’s ever come up against. Having racked up almost 200 combined appearances in the Premier League and Champions League, the winger has come up against a significant number of top-level players. Now though, the Englishman has named the one player he has found it particularly difficult to face off against. Grealish says Man City teammate is such a tough opponent READ MORE: Who is Jack Grealish? Step into the hedonistic world of Man City’s £100m wingerSpeaking in a recent video shared on the Sky Sports Premier League Y…