If Arian Foster is the engine that makes the motor run for the Texans offense, then Andre Johnson was the key that got it started. When teams prepare to play Houston, they are forced to make a potentially lethal choice of which player to try and limit.
If Andre Johnson is out for any significant amount of time, that is going to mean that Arian Foster is going to be asked to help control the game for the Texans against opponents.
With Johnson in the lineup, the Texans can be fearless in terms of the offensive play-calling because they know that there is no deficit they cannot overcome. Their ability to chew up yardage through the air and score quickly with Johnson means that they are not normally as worried about sustaining drives.
Now that Johnson is presumably out of the lineup for some time, the Texans will ask Foster to be more of a game-controlling RB instead of a game-changing running back.
For fantasy owners, this may actually be good news. Arian Foster will be sure to garner a lot of carries and while his yardage might not be affected, he should see an increased reliance in the red zone to score.
Matt Schaub and Andre Johnson have a beautiful play-action chemistry in the red zone, but now those plays will switch to simple runs by Foster in the absence of the one-on-one isolation that Johnson can usually take advantage of through the air.
This injury will surely have a huge impact on the Texans as a team, but as a fantasy owner of Arian Foster, there is probably no need to fret.