Nemanja Matic signs his new Manchester United contract. Photo: @ManUtd via Twitter

LONDON - Nemanja Matic completed his £40million move to Manchester United on Monday night and immediately vowed to help Jose Mourinho win another Premier League title.

The Serbia midfielder, a key part of Mourinho’s 2015 success at Stamford Bridge, believes the Portuguese boss has put together a squad that can rival current champions Chelsea.

"I think this squad is ready, because it’s more mature and they have already worked with Jose one year and they know what they have to do. I am sure we can do many things this season," he said.

Matic, 28, had been at Chelsea for three years and missed only three games as Antonio Conte’s side finished top last season.

But he told MUTV he had no hesitation in signing again for Mourinho.

"Manchester is one of the biggest clubs in the world and also I wanted to train with Jose again," he said.

"When you have a coach like him and a club like Manchester you don’t need to think about it, so my decision was very easy.

"He is a great coach and when I worked with him before he got the best from me and I improved a lot, so I am very happy to be with him again, especially in this great club."

Matic could make his debut in Wednesday's friendly with Italian side Sampdoria in Dublin but a more realistic target may be next Tuesday’s European Super Cup clash with Real Madrid in Skopje, Macedonia.

"I didn’t train with the first team at Chelsea, I trained alone and with a fitness coach, so it is not the same. But I have enough time and I will be 100 per cent ready very soon," Matic added.

"(The Super Cup) will be a tough game — they are the Champions League winners — but it is two giant clubs and I am happy we can compare our qualities with theirs."

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