Cushing has been out since Week 7 of last season after suffering a broken leg and torn knee ligaments. He is on the physically unable to perform list.
Foster, who has led the team in rushing three of the past four seasons, and Johnson, the franchise’s all-time leading receiver, have been dealing with hamstring injuries.
Neither played in Houston's preseason opener, a 32-0 rout at the hands of the Arizona Cardinals. It is not known if they will play in the team's second preseason game against the Atlanta Falcons on Saturday.
- Scooby Axson