Sunderland have opened disciplinary proceedings against Darron Gibson after he was filmed criticising the club in a drunken rant.
The midfielder, who joined the Black Cats from Everton in January, described the North-East outfit as "shit" and accused some of his teammates of not pulling their weight.
The claims were made during a conversation with fans following Sunderland's 5-0 defeat to Celtic in Saturday's pre-season friendly.
According to The Telegraph, Gibson said: "We're shit. Of course I'm bothered, I don't want to be shit. There are too many people at the club who don't give a fuck. You tell me who doesn't want to be at the club?"
The 29-year-old added: "Right, I'm off my face in here, but I still want to play for Sunderland, the rest of them don't though."
On Monday, the newly-demoted Championship club released a statement, which read: "Darren [sic] Gibson has not conducted himself in a manner befitting Sunderland Football Club. As a consequence, we will initiate our internal disciplinary process to deal with the matter. Darron has apologised this morning."
The North-East outfit will kick off their Championship campaign with a home match against Derby County at the Stadium of Light on August 4.