Barton was allowed to train with the reserve team this morning before manager Alan Pardew appeared at a press conference where he declared he would "not close the door" on Barton's time at St James' Park.
"I've never closed the door on anyone and I'm not closing the door on Joey," he said in a press conference shown on Sky Sports News.
"He trained with the development team today and, who knows, he may train with the first-team soon."
Moments later Barton offered further hope of a reconciliation, ironically on his Twitter page, when he made reference to world-renowned bridge builder Isambard Kingdom Brunel.
"Does anybody have Isambard Kingdom Brunel's number?" he wrote.