Ferguson (left) has great faith in Queiroz's knowledge and ability

The 54-year-old is in his second spell as assistant to Sir Alex Ferguson, having rejoined the club in 2004.

But Queiroz told the Sun: "I need to reflect on what I want to do in this last part of my career.

"In December I'm going to stop and think about myself. My contract is perpetual and caters for various options but I have only one life."

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Queiroz was Ferguson's number two from June 2002 until he left to become manager of Real Madrid in June 2003.

However, he was sacked as manager of the Spanish club in May 2004 and returned to Old Trafford in the summer of the same year.

"I am going to think about him and go for the route that makes me most happy," he added.

"I read Sir Alex said that one day he would like me to be United's main coach. That is one reason I am in this project but I'm not desperate about it.

"In your personal and professional life you always have more ambitions."