Carlo Ancelotti admitted Chelsea's clash with Manchester City on Sunday would prove decisive in their Barclays Premier League season.
Victory would see Ancelotti's men leapfrog City into third place and would also maintain their outside hopes of retaining the championship.
But defeat would surely kill off their title chances and would also put qualification for next season's Champions League back in serious doubt.
Ancelotti said: It's important we win to clarify our position in the table.
"At the moment, our position is not so clear. After this game, it'll be clear what we're going to do in the Premier League."