The Gunners lost the first leg 2-1 at the Estadio Do Dragao.
Arsenal got back to winning ways with a 2-0 win over Sunderland on Saturday, following successive defeat to Manchester United and Chelsea in the Premier league.
“We need that spirit again in the home match,” he said in the Sunday Mirror.
“We have proved it before and now we have to do it again. We have to win the home game and I am confident we will go through.
“I think that we have the quality to do that.”
“That could be important and the tie is not over yet. Not at all,” he added on Sol Campbell’s goal in the first leg.