He was suspended for eye-gouging Diego Costa in May.
"He knows he cannot do that again," Pochettino said. "He knows that one thing is to play aggressive and to tackle and to go always to the ball and be honest on the pitch. Another thing is to do what he did.
"He paid for that and it was difficult for us because he was an important player and then you miss the talent of him on the last few games last season."