The Dolphins placed Achane (knee) on injured reserve Wednesday.
Achane will miss at least four games while on IR, and with the Dolphins on bye Week 10, the soonest the running back will be able to return to action is Week 11 versus the Raiders. While Achane is sidelined, Raheem Mostert is likely to lead Miami's backfield, with Jeff Wilson (ribs) slated to practice this week and a candidate to settle in as the No. 2 option once he's activated from IR. For now, Chris Brooks and Salvon Ahmed are the depth options behind Mostert on the Dolphins' 53-man roster.