au.fourfourtwo.com can confirm the 28-year-old Australian is in Adelaide today but also understand his Saudi club have not granted him a release.

His representatives also claim no formal approach has been made, and say a lack of respect has been shown to the Saudi club, who released the Socceroo from his contract with a year left on the deal.

“I’ve had no formal approach from Adelaide United for Jon... Mr Petrillo [Reds CEO] should be respectful when dealing with Al Nasr,” said Tony Rallis.

“John has a number of overseas opportunities and we’re in the process of negotiating a satisfactory termination with Al Nasr, and we’re extremely respectful of the way Al Nasr has handled this.”

Adelaide United have not publicly announced the McKain deal.