Ancelotti is under more pressure than ever at Stamford Bridge following Saturday's shock FA Cup defeat to Everton.
It left Chelsea's season in real danger of unravelling completely, with the Barclays Premier League title all but surrendered and Champions League qualification hanging in the balance.
Their only remaining hope of silverware is also the latter competition, which they resume on Tuesday night when they visit FC Copenhagen in the last 16.
Defeat in that tie would surely test billionaire owner Abramovich's patience to what could be breaking point.