The English midfielder joined the Ibrox club on a two-year deal in May after rejecting the chance to play English Premier League football with Burnley.
But it turns out he also knocked back the Hoops, according to the man himself.
Barton is supposed to be keeping quiet while he serves out a three-week suspension handed to him by the club after a training ground incident with team-mate Andy Halliday last week.
Yet today a number of interviews have surfaced ahead of his book ‘No Nonsense’ being published on Wednesday.
It’s all typical Barton, as he talks about his move to Rangers, his current situation and some regret he’s feeling.
But he also plugs a lot of his book – in which he reveals that Celtic tried to sign him at the last minute before his switch to Rangers. Barton now says he could never have let the Ibrox club down.
He said, per guardian.com: “I was never going to change my mind and let down Rangers.
“So I wonder how that will play out when people hear about it.”
It will no doubt play out with Rangers fans laughing at their rivals while Celtic supporters deny the authenticity of the story.
Barton was wanted by Burnley again over the summer, but that’s the only club, aside from Rangers, that he was linked with in the press so the Celtic story is a bolt from the blue.
Hoops fans – do you believe your club wanted Barton?