He made little impression in Saturday's El Clasico defeat to Barcelona and has come in for heavy criticism from the Spanish press on the back of that performance.
Fabregas said in The Sun: "It's up to him. He's got a lot of pressure. One hundred million euros is massive, but I think great players are great players. He will overcome this, I'm sure he will.
"I haven't spoken to him so I don't know how he feels. You need to adapt when you come to this kind of league.
"It is completely different to the Premier League. You don't get many spaces when you get the ball.
"Tactically this league is much better than the English one, so he needs time."
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