Daniel Alves says Barcelona players are convinced of Champions League success against AC Milan.

Barca must overcome a 2-0 deficit at the Nou Camp to progress to the quarterfinals.

"The problem is all mental. When you have negative things around you, it's necessary to close yourself off, it spreads if you don't," said the right back.

"People need to see that you're going to fight to get to the next round. We need to have a connection."