Barcelona dominated the first game at the Nou Camp and will feel aggrieved that they could not take a lead with them when they play the second leg on Tuesday night.
But Milito is hoping that the big title decider at Stamford Bridge last Saturday will have taken it's toll on the United players and Barcelona can reach the final in Moscow on May 21.
Milito said: "I felt we played really well in the first leg and I believe the result was unjust because we deserved to win the game.
"We thought United were going to attack us more in the first leg and although we could only draw 0-0 it is not the worst result we could have had. We are still 90 minutes away from being in a final.
"We have had bad luck over recent games. We have played really well and the most important thing is that we produce the same kind of performance at Old Trafford.
"What worries me the most is that we would not reach the final with the players we have in our squad.
"But the players are always motivated to get the best result and we know we are playing to reach a Champions League Final.
"We know they have played a big game last weekend in their hopes to win the Premier League."