I don't think VY will play. That day to day stuff is what we were hearing before the Houston game.
Vince Young's Quadriceps Injury Could Become Chronic
His injury can be a serious one. Just do a google search on quad strains. Lots of stories of them being hard to get rid of.
I predicted that it would be easy for him to re-injure himself. If he pushes it too much, he might make it even worse--causing a permanent injury or requiring surgery.