Mourinho gave the impression of excessively praising the inexperienced 21-year-old McTominay to tee up calling out other members of the team, who were also knocked out of the League Cup by second-tier club Derby last week.
That the Chilean was deemed not good enough to make Jose Mourinho's 18-man squad for such a shambolic display at the London Stadium speaks volumes for Sanchez's slide since joining United in January.
Kudos to Custis for backing his story - even as Mourinho joked that the Sun reporter had put a "bug" on his phone. "I want to thank all of you who support us during these tough times".
The Chile global was part of the Manchester United team that lost 1-0 to Chelsea FC at Wembley in the FA Cup final back in May.
Nemanja Matic spoke alongside Mourinho at the news conference and admitted United need to improve quickly during a hard period for the club.
Mourinho says some stars care more than others
From this scathing assessment, it's clear that Shaw believes Man Utd's players should be looking at themselves rather than pointing the finger at Mourinho. We play football but everyone is trying to win, especially against Manchester United.
Mata has scaled back his regular blog in the midst of a turbulent spell for the club as Mourinho prepares his team to face Valencia in the Champions League on Tuesday.
After the defeat by West Ham, which left-back Luke Shaw described as "honestly horrendous", Mourinho is surely going to fire up his random number generator which helps him arrive at his starting XI.
'What I can do to improve things I do and I will improve the things that depend on me and my work'. So we are here and we have the chance to play a big match.
"If somebody says I was a footballer and once I didn't do my best I change my opinion. Sometimes it can help but the most important is on the pitch".
"Luke Shaw for example said something I agree with but not totally - as I am part of it, as others are - but he said it's about players on the pitch needing to perform and give more".
Jesse Lingard, Marcos Rojo, Ander Herrera and Ashley Young were absent from training, with all four out of tomorrow night's game.