The Catalan manager is worried about the Champions league comeback against Juventus side, it could be beyond the Barcelona side.
The Catalan skipper believes it would be impossible for his side to come back against the Serie A outfit in the second leg unless they produce something magical in the second leg.
Last night the Spanish giants face defeat from the Juventus side at the Turin stadium where Paulo Dybala scored two goals for his side and Juventus center half Giorgio Chiellini scored the third goal for them.
In that match, Barcelona gets to hold the position but unable to put a ball behind Buffon’s net now they faced the second significant away defeat in the Champions league in this term.
But in their previous Champions league match the Catalan side bulldozed the PSG side in their home ground by 6-1 goals and in that historical game, they proved what they are capable of.
Iniesta said: "We did some bad things, mainly in the first half,"
"In the second half, we saw something different. We deserved to score one goal but that doesn't help now.
"Juve is a good team but when you don't do things well, you are penalized a lot.
"The feeling is not as pessimistic as it was in Paris but once again we have a real uphill task in a knockout game.
"If we do things as we have to, we'll be back in the tie. If not, it will be impossible."