The red devils will travel to Spain on Wednesday in the last 16 tie against Sevilla and Mourinho is eager to start well as he eyes a place in the finals.
Speaking to Manchester United TV ahead of the game, the Portuguese tactician said; “I’m calm and I think it’s the way to be.
“It’s important to be calm for the dimensions of the game, but controlling emotions because it’s a game we have to be at the top of our level.
“It’s a very difficult stadium to play because it’s a field where the fans love the knockouts in competitions they are called the knockout teams because they are very successful in the domestic cups and especially the Europa league, the crowd plays the game they don’t just come to watch, they come to put pressure on the opponents’ and the referee’s decisions”