Barcelona winger Pedro says they can't afford to relax in the second-leg of their Champions League clash with AC Milan.

Barca drew 0-0 in Italy in the first-leg last week.

"It will be a tough game. They won't make things easy for us and we'll have to play really well," said Pedro.

"Milan has great players, they're a great team and they'll make things difficult for us. We may dominate the game, but you can never be overconfident, because at anytime they can change the scoreline."