The Texans designated running back David Johnson and linebacker Kyle Emanuel for return from injured reserve, the team announced Wednesday.
It begins a 21-day practice window for both players before the Texans have to make a decision on whether to add them to the 53-player roster.
Johnson has rushed for a team-high 408 yards with three rushing touchdowns. He has not played since Nov. 8 when a hit by Jaguars linebacker Myles Jack left Johnson with a concussion.
Emanuel also is recovering from a concussion.
The Texans also announced they promoted defensive lineman Corey Liuget from the practice squad. Liuget, a former starter for the Chargers, made a sack for the Texans in a Nov. 15 game against Cleveland.
Receiver J’Mon Moore and cornerback Manny Patterson signed to the practice squad.