I think Barcelona have no other choice in these circumstances and have to make the most of the players they have and Real Madrid they will be very superior in terms of players.
In terms of players and home advantage which is obvious. If Barcelona got Lewandowski in their lineup then they might have a shot but with their current lineup is just not enough to win. If they can pull a 2-1 lost or keep it draw on the 1st leg then they might have a shot on the 2nd leg though but Real Madrid will definitely pressure them starting from the 1st half whistle
