Tennessee Titans running back Chris Johnson might see a heavy workload Sunday against the Houston Texans.

The man brought in to share those carries Shonn Greene is "very doubtful" to play NFL Media Insider Ian Rapoport reported Sunday morning.

Greene injured his right knee in the second quarter of the Titans' Week 1 win over the Pittsburgh Steelers and didn't return to the game. The running back said after the game he didn't expect to miss time but he didn't practice all week and Rapoport's intel suggests his knee isn't as solid as Greene hoped.