With the transfer window now shut, Mourinho will have to stick with this current crop, but he could well be ruing not trying to sign Harry Maguire in the summer, as this current United defence - or the one that played today - is not up to the job, and change is needed.
"We thought, I think it was before the game against Basel, Pogba is a young guy, with a good personality, made in the academy, normally a starting line-up player, so he has the conditions to be a captain in the future."
The Portuguese conceded his squad made "big mistakes" in their second game of the Premier League season but refused to single anyone out for blame.
Speaking at his media conference ahead of Manchester United's trip to Brighton on Sunday, Mourinho ruled out Darmian calling time on his Old Trafford career.
Pascal Groß penalty! Brighton are 3-1 up!
After Manchester United romped home against Leicester, they will next face Brighton this Sunday. Chris Hughton's side didn't make the best start to the season, falling to a 2-0 away defeat to Watford.
United pulled one goal back through a Paul Pogba penalty, but it was too late as Brighton ran out 3-2 winners. The Iranian global was the top scorer in the Eredivisie last season and enjoyed an impressive World Cup for Team Melli.
"Especially that third goal - we expected to come [in at half-time] at 2-1 with positivity - then the third goal killed us off in the second half".
Manchester United manger José Mourinho has hit out at Manchester City over the new documentary charting their 2017/18 Premier League title winning season, claiming that his rivals "can't buy class".
That reprieve lasted just 10 minutes, however, before more rash defending by Bailly allowed Brighton to restore their two-goal lead.
In team news, Mourinho should welcome back Romelu Lukaku & Jessie Lingard after their World Cup adventures. Fred is likely to be sat at the base of a three-man midfield and will be charged with breaking up the play and kick-starting United attacks on the break.