Paul Pogba underwent a scan on his hamstring injury behind closed doors at Manchester United's training ground on Wednesday.
United invested millions in state-of-the-art medical equipment at their Carrington base to assess stars rather than utilising nearby hospitals.
Pogba headed straight for the tunnel after pulling up just 19 minutes into Tuesday's Champions League victory over Basle and later left Old Trafford on crutches.
Paul Pogba has had a scan on his injured hamstring behind closed doors at Carrington and has posted a photograph on his Instagram, saying: 'When you know all will be fine'
Pogba's Champions League opening game was cut short as Manchester United beat Basle 3-0
The 24-year-old - and captain on the night - limped off at old Trafford after just 19 minutes
It is his second hamstring problem in six months and Jose Mourinho fears he could miss a cluster of matches before October's international break.
United face Everton, Southampton and Crystal Palace in the Premier League, plus a trip to CSKA Moscow in Europe.
Mourinho faces an anxious wait to see the extent of the setback, with their first game back after the internationals being at Liverpool just a month away.
'Paul's going to be a massive miss and hopefully we can get him back fit as soon as possible,' Marcus Rashford said.
'That's why you have such a strong squad. It's good for the manager, it's good for the players as well because we're