De Boer reportedly came back with a punch after Man United’s defeat to Sevilla in Champions League.
Ex-Crystal Palace manager Frank De Boer was involved in a spat with Mourinho over Marcus Rashford.
De Boer said it was a ‘pity’ Rashford has to work under Mourinho, and Portuguese hit back at him calling him the worst manager in the history of Premier League.
De Boer replied:
“I may be the worst manager in the history of Premier League.
“But he is the manager that spent roughly 1 billion pound in his career and makes his teams play like that.”