Chelsea manager Enzo Maresca has excluded Conor Gallagher from the first-team group.
According to talkSPORT, Gallagher has been banished from the dressing room.
Chelsea has accepted a £33 million bid for Gallagher from Atletico Madrid, but the midfielder wants to leave on his own terms.
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Gallagher, whose contract expires in 2025, has also turned down two recent offers from Chelsea for a two-year extension.
The club has informed the 24-year-old that he will not be training with the first team when they return from their pre-season tour of the United States.