Premier League - Newcastle to let Barton go for free
The news was revealed in a club statement on Monday afternoon not long after the player himself had stated he would be making an announcement later in the day via his Twitter feed.
The statement read: "Newcastle United can confirm that Joey Barton has been placed on the transfer list today (Monday).
"The player has been advised that he can leave the club on a free transfer."
Barton responded by appearing to lay the blame for his expected departure at the feet of those in control at St James' Park.
He tweeted: "Somewhere in those high echelons of NUFC, they have decided, I am persona non grata.
"I am on a free but the honour of wearing those B+W stripes, surpasses that.
"One day the board might realise, what the shirt signifies. HONOUR and PRIDE. Thanks for your continued support........... #toonarmy"
The outspoken Liverpudlian has rebuilt his career at St James' Park after serving a six-month ban from football and serving prison time for assault, and last season scored four goals and set up nine more as Newcastle finished safely in mid-table on their first campaign back in the Premier League.
However, that has not stopped the club letting his four-year contract enter its final year, and the offer of a two-year extension on reduced terms was earlier turned down by the 28-year-old.
Since then Barton has used the social networking site to vent his frustrations at the club's hierarchy and its transfer policy, in particular regarding the future of himself and left-back Jose Enrique.
On Sunday he wrote: "If I wanted to leave, I'd just come out and say 'I want to leave'. Things need addressing as am not prepared to go through a relegation again."
On Monday afternoon he added: "I wont be commenting on situation at Newcastle again, as I feel it helps nobody and serves no purpose. Hope u all understand," only to add barely 30 minutes later: "I will be making an announcement regarding my future, on here at 4pm today........"
However, Newcastle pre-empted that announcement by releasing their own statement breaking the news.