Peterborough United have fined and transfer-listed four players, including club captain Gaby Zakuani, for a breach of club discipline.
PA PhotosGaby Zakuani is one of four players transfer-listed by Peterborough
The Championship club have also placed Tyrone Barnett, their record signing, and fellow forwards Nathaniel Mendez-Laing and Emile Sinclair on the list, with the decision following an internal inquiry.
The club has not said what the breach of discipline was, but a statement on the official website said: "Peterborough United are disappointed to report that Gabriel Zakuani, Nathaniel Mendez-Laing, Emile Sinclair and Tyrone Barnett have been transfer-listed and fined by the football club following an internal investigation into a breach of club discipline.
"The club will be making no further comment on the matter."
Zakuani now appears likely to be stripped of his role as club captain after four years at the club during which he made more than 150 appearances.
Barnett and Sinclair arrived at London Road last season from Crawley and Macclesfield respectively, while winger Mendez-Laing joined from Wolves during the summer.
Information from the Press Association was used in this report