Antonio Conte's men are hefty 4/11 (1.36) favourites and will be looking to bounce back from a 1-0 loss at home to Manchester City last time out - their second defeat at Stamford Bridge already this season - and should do so easily at Palace.
According to the Daily Telegraph, Koscileny has hardly trained over the worldwide break but is ready to return to the fray in light of Shkodran Mustafi's absence, after the former Valencia defender suffered a serious groin injury playing for Germany last week.
Kolasinac only managed one half while in action for Bosnia-Herzegovina against Belgium due to a hip injury, while Koscielny is set for a late fitness test on an Achilles injury.More news: No Colombia pact, insists Peru's Tapia
However, Wenger did have good news regarding Mesut Ozil and Danny Welbeck with both players back in training.
Alexis Sanchez will be assessed when he returns from global duty after he received "special treatment" following Chile's 3-0 defeat to Brazil.
LONDON, ENGLAND - MAY 27: Per Mertesacker of Arsenal and Arsene Wenger, Manager of Arsenal speak prior to The Emirates FA Cup Final between Arsenal and Chelsea at Wembley Stadium on May 27, 2017 in London, England.More news: Singleton truck crash: Driver of alleged stolen semi-trailer refused bail
"The minor problem we have with Sead Kolasnic, we'll check him today, it's a hip problem", the Frenchman said on Thursday.
"Not all the players are back. But he trained on his own and the first signs are positive so we chose to give him a test tomorrow".
"Koscielny will have a test tomorrow", Wenger added.More news: Body Cam Footage Shows Alex Morgan Arguing With Disney World Police
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