Ollison reverted to Dallas' practice squad Monday, per the NFL's transaction log.
Ollison made his season debut in Week 8 but saw just two offensive snaps, as Tony Pollard (31) and Malik Davis (19) dominated the work in the absence of Ezekiel Elliott (knee/thigh). With Dallas on bye in Week 9, Elliott will have plenty of time to clear his minor injuries, so it seems unlikely that Ollison will be elevated again when the Cowboys return to action in Week 10.