The Everton midfielder received a warm ovation from his fellow squad members after issuing an apology for his extraordinary dismissal during the recent victory at Old Trafford.
Gueye earned the distinction of being the first Premier League player to be dismissed for hitting a teammate in 17 years when he slapped his defensive colleague during the fixture. The Toffees' display was remarkable as they played with a man down for 85 minutes, including stoppage time, to achieve David Moyes' initial victory at Old Trafford as a visiting manager in multiple tries.
'My first apology goes to Michael Keane,' he wrote on his accounts. 'I take full responsibility for my reaction.'
The Senegalese international was unable to secure an opportunity to speak with Moyes or his colleagues at half-time. Afterwards, with the visitors' locker room buzzing after the narrow victory, the 36-year-old requested to speak to the entire group and the defender in particular.
The 36-year-old may yet be punished by the club despite Moyes' admission that he appreciates his players competing with each other. Moyes has a standard punishment process for red and yellow cards, including financial penalties, which is expected to be implemented in Gueye's case.
Everton may find themselves without their key midfielder until the new year. Gueye will serve a three-game ban against Newcastle United, Bournemouth and Nottingham Forest but might be selected for Africa Cup of Nations responsibilities by his national team before he becomes eligible to play against the Blues on 13 December.
'Passions can sometimes overflow,' he added. 'But nothing justifies such behaviour.'
Meanwhile, Mathijs de Ligt claimed his team of showing no urgency in the recent defeat, which ended their winning streak at five games.
The Red Devils travel to Crystal Palace for the weekend lunchtime start. 'The next game is really important now,' commented the defender. 'We have to bounce back from this performance.'