Malzahn said he made the move Wednesday before the Tigers' first practice of preseason camp. He says the team's top returning rusher didn't meet his standards for an Auburn player but declined to elaborate.
He added that, "There's going to be no distractions."
Robinson came on strong late last season and ran for 639 yards and three touchdowns. Leading rusher Peyton Barber left early to enter the NFL draft, and No. 3 runner Roc Thomas transferred to FCS Jacksonville State.
The Tigers added former Baylor signee Kam Martin this summer after he was granted a release from his scholarship.