Man United mutiny: Now Amad Diallo's 'f***ing disgrace' post follows Lisandro Martinez's rant, as Wayne Rooney fears dressing room could be 'ripped apart'

Diallo took to Snapchat in the wake of United's 2-0 Champions League defeat by Atletico Madrid , writing: 'F***ing disgrace, I have no words,' alongside a picture of himself on the pitch. It's not known whether Martinez was referring to the United performance, Martinez's comments or any other grievance at a club veering wildly into crisis mode. Diallo came off the bench and played the last 25 minutes of another dispiriting defeat for Michael Carrick 's men but the most extraordinary development arrived after full time as Martinez conducted his post-match interviews.