This season, Didier Drogba and Fernando Torres have been dispelling the old footballing adage that good players will play well together no matter what.
Neither of them have scored a goal while the other has been on the pitch since Torres' multi-million pound move from Liverpool in January.
There have been constant mutterings and signs of dissent from both men, who have both, at some point, been considered the best striker in world football.
Ancelotti has showed reluctance to start Torres this season, preferring his tried and trusted partnership of Anelka and Drogba but it is very obvious that he is under severe pressure from Roman Abramovich to utilize the £50 million man.
Ever since Torres scored his first goal against West Ham, he has been growing in confidence and has looked sharper than he has done all season.
But against Tottenham, Drogba showed a reluctance to make the partnership work and it was only after Torres had been substituted that the Ivorian came alive and ultimately set up the winner.
Torres struggled to cope with the defensive partnership of Vidic and Ferdinand in the Champions League, but he was deployed as a lone striker, and Anelka and Malouda failed to support him as wingers should.
In the most important game of the season, Chelsea have to make a huge decision. Do they trust to the fact that Torres and Drogba will finally make it work?
Or is is time to accept that these two will never gel as a strike combination?
In that case, it would probably make more sense for Drogba to be the main man up front with support from his old partner Anelka and Malouda.
Torres could come on as an impact player, but at this stage in his Chelsea career, he still lacks the ability to terrorize defenses as Drogba has done his whole career.