Thibaut Courtois missed the game against Manchester United on Saturday and Marcos Alonso pulled out of the starting XI just minutes before kick off after struggling in the warm up before the 2-0 defeat.
Reports have now emerged other Chelsea players were also under the weather.

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The Telegraph report that trio Alonso, Costa and Moses all missed training on Friday because of sickness.
Moses didn’t look his usual self as he was substituted early in the second half, and Costa as well didn’t have a good game.