Jose Mourinho may not get the fourth and final signing he craves at Manchester United this summer, but he will have no reason to complain.

The Portuguese has already spent around £150 million on Victor Lindelof, Romelu Lukaku and Nemanja Matic, but is struggling on sealing the final piece of his jigsaw.

Inter Milan's Ivan Perisic is believed to be his other target, but a deal for the Croatia international is currently stalling as the Italian outfit hold out for a huge fee for the winger.

Days before the arrival of Matic, Mourinho admitted: "If my club is not able to do two players and is able to do just one, I will accept that as a consequence of the market now."

And with the former Chelsea midfielder now in the building, the Portuguese will be expected to have no gripes about his club's dealing in the transfer window.

But United's position as one of the favourites for the Premier League title this season will not simply be down to their new signings, but the strength in depth they already have at the club.

Mourinho boasting strength in depth

David de Gea, Eric Bailly, Paul Pogba, Ander Herrera, Juan Mata, Henrikh Mkhitaryan, Marcus Rashford and Anthony Martial are all star names who Mourinho already boasted in his squad.

Although, speculation during the January transfer window from the latter's agent suggested Martial was in talks over a loan move to Sevilla.

However, rumours surrounding a temporary move to Spain never surfaced - although the France international managed just 18 starts and four goals in the Premier League last campaign.

It was in comparative disappointment to the 11 league goals he scored in his debut campaign at Old Trafford, under Louis van Gaal, and seemed he could be the first to be axed by Mourinho.

The United boss isn't afraid to show players the door and Martial may have feared something similar at times last season. But the Portuguese has confirmed the forward's place in the team is safe.

United boss backs bit-part player

“I have faith in him,” Mourinho said, per The Independent.

“As a pure attacking player, Anthony is a good player. I believe he is one of the players that is going to have a better season this season than the previous season.

“I look at some of my players and I am sure some players are going to be better this season than they were last season, and Anthony is that for sure.”

That will be a relief to United's hierarchy, who had at the time spent a world-record initial £36 million fee for the Frenchman, potentially rising to £58 million.

But while Martial may be happy with Mourinho's comments, he will have to work even harder this campaign with the arrival of Lukaku in the attacking department and the potential return of Zlatan Ibrahimovic.