Jose Mourinho has called on those members of his Manchester United squad still on holiday to report back ahead of schedule.

Paul Pogba, Romelu Lukaku, Jesse Lingard and other United players who progressed to the latter stages of this summer’s World Cup are yet to take part in the club’s pre-season.

Mourinho has complained of a lack of available first-team players throughout United’s five-match tour of the United States.

How will Manchester United line up this season? Show all 12 1 /12 How will Manchester United line up this season? How will Manchester United line up this season? How Manchester United could line up this season? Getty How will Manchester United line up this season? GK: David de Gea United's outstanding player year in year out, De Gea was the reason for last year's impressive defensive record. Getty How will Manchester United line up this season? RB: Antonio Valencia Michael Carrick's replacement as captain and a faithful servant, but "too much holiday" has left Valencia unfit to start the new season. Getty How will Manchester United line up this season? CB: Eric Bailly United's best centre-back on his day, his progress at Old Trafford has been hampered by persistent injury problems. Getty How will Manchester United line up this season? CB: Phil Jones After the frustration of missing out on a centre-half, Mourinho will have to turn to his existing options. Jones can be error-prone but, when fit, is probably the best of them. Getty How will Manchester United line up this season? LB: Ashley Young United's failure to land a left back means Young, naturally a winger, is likely to continue in a makeshift role this term. Getty How will Manchester United line up this season? CM: Nemanja Matic Perhaps the most successful of Mourinho's second season acquisitions, Matic screens the back four well but can struggle against intense pressing. Getty How will Manchester United line up this season? CM: Fred A new arrival from Shakthar Donetsk, Fred also courted interest from Manchester City before signing on at Old Trafford. Getty How will Manchester United line up this season? CM: Paul Pogba A mixed first year back at United was followed by a difficult second. Fred's arrival could, in theory, allow him to express himself better. Getty How will Manchester United line up this season? RW: Jesse Lingard A player who has made the most of the opportunities handed to him, Lingard has now finally established himself and won the trust of all at Old Trafford. Getty How will Manchester United line up this season? LW: Alexis Sanchez January's marquee arrival from Arsenal has underwhelmed initially, but could find his best form after a much-needed summer break. Getty How will Manchester United line up this season? ST: Romelu Lukaku 27 goals in 51 appearances during his first year with United was a reasonable return and Lukaku has more than enough quality to improve on that record. Getty

Following Saturday’s 4-1 defeat to Liverpool in Michigan, the Portuguese claimed that United’s travelling party was “not even 30 per cent” of his first-choice squad.

Marcus Rashford and Phil Jones, who were both with England at the World Cup, will return from their post-season breaks early this week and Mourinho wants others to do the same.

“I hope that the boys on deserved holidays take care of themselves a bit and that somebody wants to do what Rashford and Phil Jones decided to do, which is to be back a bit earlier to try to help the team because for the beginning of the season we are going to be in trouble,” he said after the defeat to Liverpool.

As well as Pogba, Lukaku and Lingard, Ashley Young and Marouane Fellaini are also on holiday after reaching the semi-finals of the World Cup.

The likelihood of any of the five absentees featuring against Leicester City on 10 August - United's first game of the season and the opening fixture of the Premier League season - appears remote. Mourinho's hand may be forced, however, if injury problems mount.

Mourinho has already ruled Nemanja Matic out of the opener after the midfielder underwent surgery on an abdominal problem. Chris Smalling and Luke Shaw missed Saturday's defeat to Liverpool through injury, while Eric Bailly played through the pain barrier.