Manchester United boss Jose Mourinho told Chelsea fans "I'm still number one" after being heckled during his side's FA Cup loss at Stamford Bridge.
Mourinho, sacked twice by Chelsea, was called 'Judas' by fans during United's 1-0 defeat, responding by pointing three fingers in reference to the three 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 set up a semi-final against Tottenham at Wembley.