By FOX Sports Staff
The Frenchman was part of the side that ran out 2-0 winners against the La Liga side at the San Siro on Wednesday night. But he now has to turn his attention to another test of his defensive abilities as the side prepare for Sunday's clash with local rivals Inter Milan.
Milan are currently just one point ahead of Inter and trail league leaders Juventus by 11 points. Despite the distance between the Rossoneri and the top, Mexes is opting to stay positive and believes it is of the paramount importance for his team to register a win against another title contender in the Nerazzurri.
"It was satisfying to beat Barcelona, but we still haven't done anything yet," the defender told the Milan Channel.
"We have to focus on our upcoming fixtures in the league. We still have to try and win something. The most difficult thing to handle now is the euphoria resulting from Wednesday's game.
"We are aware that the derby is crucial for the championship and Sunday we will do everything to win."
Mexes earned praise for his defensive showing in the Champions League and he is happy to have forged a good understanding with Cristian Zapata at the back. Nevertheless, he does not wish to take Milan's strength in defence for granted and singled out the Inter dangermen.
"We have a great understanding. But, there is also [Mario] Yepes and [Daniele] Bonera. Competition between us is beautiful because it is healthy," he continued.
"[Rodrigo] Palacio and [Antonio] Cassano are two good players and we have to be careful. Whoever makes the fewest mistakes will win.
"Former Inter striker Balotelli? He's now at Milan and he'll be a danger for the Nerazzurri."