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Salomon Kalou—the most obvious person on this list.
Kalou is used mostly as a sub these days, after AVB decided to bench him in Chelsea's second game of the season against West Bromwich Albion when he completely bombed his performance, earning him a much deserved substitution in the 35th minute of the match.
Since then, he has gone on to foil Chelsea's hard-earned 1-0 lead in their Champions League match away against Valencia, when he foolishly committed a handball in the box in the last minutes of the game.
As a result of all of these gaffes, his exit in the next few months is the most likely of any Chelsea player's, especially considering his contract to CFC expires this summer.
The club may decide that instead of waiting to release him on a free at the end of the season, they'll attempt to offload the striker in the January transfer window—a move that would doubtless delight many a Chelsea fan.