Manchester United manager Jose Mourinho told Chelsea fans "I'm still number one" after he was heckled during the FA Cup quarter-final at Stamford Bridge.
Mourinho, sacked twice by Chelsea, was called 'Judas' by the crowd and responded by pointing three fingers in reference to the three Premier League titles he won with the club.
He said: "Until the moment they have a manager that wins four Premier Leagues for them, I'm the number one.
"Until then Judas is number one."
N'Golo Kante's low shot was enough for Chelsea to beat holders United - who had Ander Herrera sent off in the first half - and seal a semi-final against Tottenham at Wembley.