Maurizio Sarri’s days at Chelsea looked severely numbered.Eight days after losing 6-0 to Manchester City in the Premier League, the Blues have now been dumped out of the FA Cup by Manchester United.It was definitely an improved performance from Chelsea but headers from Ander Herrera and Paul Pogba in the first-half sealed passage into the quarter-finals for the Red Devils.And towards the end of the match, the home fans started to lose their patience.In truth, it was the substitutions that did it for them.Trailing 2-0 and looking for a way back into the game, Sarri did nothing to change his ‘Sarriball’ tactics.He brought on Willian for Pedro and Ross Barkley for Matteo Kovacic - two ‘like for like’ changes that angered Chelsea fans.But when Sarri brought on Davide Zappacosta for Cesar Azpiliceuta with eight minutes remaining, the home supporters lost all hope.With Callum Hudson-Odoi and Olivier Giroud sitting on the bench, the final change seemed pretty inexplicable.Rather loud chants of “F**k Sarriball” could be heard echoing around Stamford Bridge in an obvious dig at their Italian manager.

Then, Frank Lampard's name could be heard being sung in the hope the club legend would return to replace Sarri.

As you’d expect, Sarri was asked about those chants after the 2-0 loss in his post-match press conference.

His response?

“I am worried about the result. Not about the fans,” Sarri said.

“I can understand the situation because the result wasn’t good. We are out of the FA cup so I can understand. I am worried about our results.”

Could he hear the chants?

“Not very well, but sometimes yes,” he replied.

Has he heard his own fans chant “f**k Sarriball” before?

“No, for everything there is the first time,” he admitted.

Sarri may be putting a brave face on things but how do you come back from your own fans verbally abusing your tactics?

By winning the Carabao Cup in six days time, perhaps…