Mourinho would not elaborate on suggestions that Pogba had aggravated a long-term hamstring problem, or claims that the midfielder has been working with a personal trainer against club advice. That's the only one I'm thinking about.
There are fears Pogba may have also suffered a thigh strain after stretching to make the challenge and United's medics have not been painting a positive picture.
"Squads are (there) to try to cope with these kind of situations and we know that for a few matches - I don't know how many, I really can not tell you how many I expect - but we are going to play without Pogba a few matches".
United entertain Everton at Old Trafford on Sunday afternoon, hoping to maintain their unbeaten start to the season and remain top of the Premier League in the process.
As he has showed since joining United in 2014-particularly last season-Herrera is a player of enormous quality who will have a big role to play this term as United hunt for silverware domestically and in Europe.
"Honestly, we miss Pogba and we need him, but we have good players". Today we went back to two again and I had on the bench Carrick and Fellaini, which were also important players in the last season.
Marouane Fellaini, who replaced Pogba against Basel and scored the opening goal in the 3-0 success, is another option to come in against his former side, along with club captain Michael Carrick.
The Spaniard was one of United's standout players during the 2016/17 season, as he made 50 appearances in all competitions with his energy and work-rate earning him the club's player of the season award.
Pogba's injury does mean that some players will be given a chance to prove themselves in the Frenchman's absence, however, with Ander Herrera likely to be called upon, having spent much of the new season on the bench, so far.