West Ham boss Slaven Bilic held crunch talks with Diafra Sakho yesterday.
The London Evening Standard says Sakho was back training with West Ham on Friday, following his bizarre transfer-day attempt to engineer a move to French club Rennes.
The Senegal striker also had talks with Bilic about the future, with West Ham insisting on an immediate improvement in the player's behaviour if he wants to avoid club sanctions.
Bilic is understood to have told the player that any future similar behaviour will not be tolerated and that he must stay fit and play a certain percentage of games before next January, when his position at the club will be further reviewed.