8:19AM BST 13 Jul 2011
"Visa story is correct," said Barton on his Twitter page. "They told me am not allowed in until I have 5yrs without any trouble. 3yrs down, 2yrs to go.
"Totally hypocrisy considering what they get up to but rules are rules."
"I cant be bothered dwelling on negative's, this is my last post about the visa situation."
The 28-year-old, who was given a six-month jail sentence after admitting assault and affray in 2008, has been denied the necessary permission to travel with the rest of the first-team squad when they leave on Sunday.
Newcastle said that Barton will instead link up with Peter Beardsley's reserves when they head for Holland on July 20.