The Argentine midfielder and his Eagles teammates need to beat the Catalan giants on Wednesday night in order to qualify for the next phase of the Champions League and ironically, it is the mindset of the team they want to knock out of contention that they will be following at the Nou Camp.
"We have to play our perfect game and hope that Barca perform at only 50 per cent. But it's possible.
"Our destiny is in our own hands. Celtic will be favourites to qualify but we can still do it."