Barca face AC Milan tonight, having lost to the Rossoneri last term.
"We learned from last year's experience [2-0 loss against AC Milan in the San Siro]," said Alexis.
"Milan has always shown great heart, it is important to play 90 minutes with great concentration. I always give my 100 per cent.
"In Barça there are so many good players, I am ready to play but I do not feel a starter. The criticisms gave me more strength. Playing with Neymar gives me happiness and confidence."
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