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Jose Mourinho is targeting an immediate return to the Champions League and has warned players to forget about the last three years.
United have struggled since Sir Alex Ferguson's retirement in May 2013 with David Moyes and Louis Van Gaal both paying the price for failing to secure Champions League football.
Mourinho has enjoyed success wherever he has managed and he has been tasked with returning United to the top of English football and he believes it is important for the club to be competing in the Champions League.
"It's a job everyone wants and not many have, and I have it. I know what the fans expect from me," Mourinho told reporters at his official unveiling on Tuesday.
"I know obviously the responsibility, expectation and at the same time I know the legacy and what is behind me and the history of this club and what the fans expect from me.
"This challenge doesn't make me nervous, it comes in the right moment for my career. I have great motivation. I am where I want to be. I want to be in this club, in the Premier League and I feel frustrated I am not playing in the Champions League.
"I don't hide. I chase Sir Alex's record in Champions League matches. Hopefully it is only one season we are not there.
"Manchester United is a Champions League club. In July 2017, instead of waiting for Europa League play-offs, we make sure this club is where it is meant to be - the Champions League."
Mourinho won the Premier League with Chelsea in 2015 but he was sacked in December after a dismal start to the season.
Despite his departure, Mourinho does not believe he has a point to prove to others in the Premier League.
"There are some managers who haven't won titles for 10 years. Some of them never. The last time I won was a year ago," he added.
"If I have something to prove, imagine the others. That's my feeling. I feel that I have to prove not to the others, but to myself. I would never be able to work without success, that is my nature."
Meanwhile, the new manager has made it clear he will not use Wayne Rooney as a midfielder.
Rooney adopted a deeper role under Van Gaal, often starting as an attacking midfielder, but Mourinho believes the captain can still be a threat in front of goal.
"I think in football there are many jobs. The hardest to find is the one who puts the ball in the back of the net," Mourinho said.
"It is normal, at his age, for a player to change a bit but one thing that will never change is the appetite to put the ball in the net.
"He is maybe not a No.9 anymore but, for me, he will never be a No.6. He will never be 50 yards from goal. Yes, he has a great pass but I have a great pass under no pressure.
"He will be a No.9, a No.10, maybe a 9-and-a-half but never a No.6 or even a No.8."