Grant also says he's allowing suspended senior JaMychal Green to return to practice.
Grant said earlier Monday he didn't expect either to play Thursday night at Arkansas. He didn't elaborate on his decisions or a timeline for Green to return to game action when he released his statement.
Mitchell has been out for the last four games while Green has been suspended for the past three. Guards Andrew Steele and Trevor Releford were suspended at the same time as Green but only missed the LSU game.
Mitchell and Green are the team's two top scorers and rebounders. Green is averaging 14.1 points and 7.2 rebounds while Mitchell averaged 13.1 points and 7.0 rebounds.