Chelsea boss Mauricio Pochettino is adamant Nicolas Jackson will develop into a "fantastic player".

The summer arrival from Villarreal has been hammered by certain pundits in recent weeks.

But Pochettino, when asked about the number of yellow cards Jackson has collected, said: "Today we were talking about that as we had a meeting with him and also Enzo. A striker, four yellow cards only for talking with the referee. Not because of that, it is so cheap and it is going to bring a difficult situation to the team. He understood. Jackson is young, he is going to be a fantastic player.

"He needs to be calm and relaxed.

"We are talking about young players, you can blame me or blame us but they need time. There's no doubt we have amazing talent but they need time.

"He needs to be clever and not protest to the referees. Maybe it's because it's his normal behaviour on the pitch, this season change the rules, he came from Spain and it's different and the change is more sensitive about this. It is about adapting. I hope on Sunday we are not talking about him being clever and first action he is getting a yellow card."