“I’m going to ask for a DNA test. They must have swapped him on the plane (when he joined from Super Rugby’s Hurricanes),” he told French radio RMC on Sunday.
“When we reach this level of play, we must apologise and leave.
“I told him he was released and he was no longer welcome at Toulon.
“He has got a year left on his contract. He can do what he wants.”
Toulon are languishing in 11th place and Savea, a 2015 World Cup winner and 54-Test All Blacks veteran, has come under heavy criticism from fans for his lacklustre form since arriving at the club.
Savea responded on Monday, tweeting he intended to see out his contract and would turn up to training with a “positive attitude … whether I am welcomed or not”.
Australian winger Mitchell was part of Toulon’s Champions Cup wins in 2014 and 2015, before he forced his way into the Wallabies’ World Cup team.
He said Boudjellal, a comic book magnate with a reputation for lashing out at players in the press, needed to realise there were other ways to make headlines.
“They’re very passionate, especially in the south of France,” Mitchell told AAP.
“I get where they (the fans) are coming from and I’ve experienced that side of Mourad.
“But his (Savea’s) form is a separate issue; that stuff should be kept in the locker room.
“He doesn’t deserve that and the flow on means other players and especially former All Blacks won’t be encouraged to go there.”
Mitchell’s tweet which condemned Boudjellali’s comments was endorsed by Savea’s brother and fellow All Black Ardie, while Savea’s wife Fatima defended the 28-year-old on social media after she revealed the abuse he had copped from fans.
“Take a minute to think about how your words can affect someone’s life and their mental health,” she tweeted.
“And people wonder why mental health in rugby had become a big problem.”
Attending the Reds versus Brumbies game at Suncorp Stadium on Sunday afternoon in 33-degree heat was a good chance for Queensland Reds fans in the Western stand to get to know one another up close and personal, with 13,500 cramming into the shady side of the stadium.
With all the reporting and leaking and reacting and denying going on over the weekend and late last week around the now confirmed demise of the Sunwolves from Super Rugby, though it’s difficult fully know who is pulling which stings, one thing stands out as a clear common denominator.