Jose Mourinho has singled out former Chelsea midfielder Nemanja Matic as the Red Devils' most important signing of the off-season transfer window.
The Manchester United boss revealed his surprise at being given the opportunity to secure the services of the Serbia international, saying that he never expected the Premier League champions to agree to a deal.
"When I joined last year I thought immediately that we needed a kind of Matic but there are not many," Mourinho told reporters. "But I was not thinking of it because I always thought I never like to go to players that are the impossible mission and I felt there is no chance [of Chelsea selling him].
"When this season I got the call that Matic wants to play for me, wants to play for Man United and we can make it happen, I thought, 'it's the perfect player for me.' Not just for his qualities but also for my relationship with him, the way I know him," the former Chelsea boss continued.
"He's one of those players with no question marks in front. He doesn't need time to adapt to England. He's one of those players that gives me what I like in players, which is consistency. So I think he was a fantastic signing for us."
Mourinho went on to discuss whom he believes will be challenging for the Premier League title this season, suggesting that football fans could be in for an entertaining eight months.
"Manchester City have a fantastic manager, great spending, already very good players," Mourinho said. "They're equipped.
"I think Tottenham, without spending, are equipped to win the title because they have a fantastic team, fantastic manager, great stability.
"Arsenal the same. A great, experienced manager, the same team. They didn't sell, as some were expecting, players like Mesut Ozil, Alexis [Sanchez]. They're equipped.
"Liverpool, they're equipped. Chelsea is the champion, lost some players, bought some players, they're equipped.
"So it's difficult to say which of us is better equipped. I just think the competition can be better than ever," the 54-year old added.