BARCELONA host Real Madrid in a huge El Clasico tonight that Michel Salgado and Rivaldo see being a very tight affair. As ever, Lionel Messi will be the one to watch at the Camp Nou in a game rearranged from October amid Catalan independence protests. Madrid sit in second place in La Liga on goal difference going into the Clasico and former forward Rivaldo thinks they are unlikely to find a way to stop Messi in time for Wednesday’s derby. The Brazilian told BetFair: ”It’s really difficult because he is always playing great and he’s been playing this level for a long time. “A Clasico is a different match, but Messi is always calm in these matches. He’s always looking for a goal, scoring goals… It’s difficult to stop Messi, but I’m sure Real Madrid will try their best, because if not, he will score goals. “Messi won’t last forever. One day his final match will arrive and he will leave football. Now he is making the difference, scoring goals… but you have to have another player to play his actual role.”Just one player can be the substitute of Messi at Barcelona and that player is Neymar. “He was wrong leaving…