Neither team could break the deadlock and the game remained scoreless at half time.
City boss Dave Jones kept faith with the side held to a scoreless draw by Derby.
Portugal had the ball in the net through sub Postiga but he was well offside and the game was destined to end scoreless.
The match between Lille and Benfica has also finished scoreless, so United have their destiny in their own hands.
The defense was smothering, and even after Wolves Ty Shaw went to the free throw line, they were still scoreless.