Arsenal are at end of their cycle and Arsene Wenger need Emirates clear-out, says Emmanuel Petit Arsenal defender Thomas Vermaelen highlighted the need for mental strength as they looked to bounce back from their San Siro nightmare with FA Cup victory at Sunderland. "When you are a professional you put the bad things that happen behind you," Vermaelen said. We will have to learn our lessons from what happened in Milan, but it is important at times like this to remain mentally strong and focus on the next game. While the second leg at Emirates Stadium in a fortnight is almost redundant, the 26-year-old claimed the players owe it to the Gunners' fans to produce a performance. The only thing we can do is remember that we've still got another game to go. Now we have to show some pride and give 100 per cent in the return leg," Vermaelen said. We have to give something back to all those Arsenal fans who came all the way out here to this stadium, here in Milan, only for us to disappoint them. We must think of them now because what happened was not good. The only thing we can do is give them a good result in the home game.