CONFIRMED: Here’s the Man United defence set to play in first game of the season

That means he has already decided upon the back four that will kick off the season against Leicester City on August 10.

Mourinho watched his side draw 1-1 with Club America in the US on Thursday night, reports the Manchester Evening News.

The club's executive vice-chairman, Ed Woodward, was in attendance to watch the side and is continuing to push ahead with transfer business.

The 46-year-old is in contact with Jose Mourinho every day - often via Whatsapp - but always makes a point of catching up with him face to face during pre-season.

High up on the shopping list Mourinho handed Woodward in the spring was an international centre-back. Initially, it may have seemed a strange request.

United have bought a centre-back in each of the last two summers and currently have five defenders battling it out for just two positions: Chris Smalling, Eric Bailly, Phil Jones, Victor Lindelof and Marcos Rojo. That is without even mentioning youngster Axel Tuanzebe.

Also, the reality is United will have to pay at least a club-record fee for a defender to land their ideal target.

The club is looking at defenders aged between 23 and 29 who have played in the Premier League, Serie A, La Liga or the Bundesliga and are as comfortable with the ball at his feet as they are making a headed clearance.

But it will not be easy and one high-level source at United is well aware that some of those players under consideration 'are not possible and real'.

Among those players United have looked at, somewhat ambitiously, are Raphael Varane, Toby Alderweireld, Jose Gimenez, Alessio Romagnoli, Milan Skriniar, Jerome Boateng, Kalidou Koulibaly and Caglar Soyuncu.

Mourinho, though, does not appear too sure United will get their man. Having already said that he had 'no idea' if United would make any further additions, following the signings of Fred, Diogo Dalot and Lee Grant, he dropped his biggest hint yet in his first pre-season line-up.

Smalling and Bailly, the centre-backs who did not go to the World Cup, started together

While it is easy to read too much into that, Mourinho made a point of repeatedly pairing Smalling with Lindelof last summer as he knew both Jones and Bailly would be suspended for the Super Cup clash with Real Madrid.

Equally, a number of those defenders on United's radar played at the World Cup and may be lacking match sharpness by the time the window closes.

Regardless, with his latest gesture, Mourinho all but confirmed his back line for the first league game of the season against Leicester on August 10.

"Valencia, Smalling, Bailly and Shaw, they are probably the ones to start the season," he told MUTV.