Ouch. The PD is reporting that Steven Jackson did not suit up for practice with the team today. That gives him one more day to see if his injured thigh is up to carrying a full load.
Jackson spoke about his injury on his radio show, The Rush, on Tuesday (listen here), noting that it's a lot more complicated of an injury than it seems. Deep tissue bruises are pretty serious matters, as the larger ones (like a high speed impact in football) can bleed into the quad muscle and cause a hard calcium deposit. I'm no doctor, but I'd say that Jackson's attempt to play against the Cardinals made his injury worse. In some cases it can take up to six weeks to fully heal.
I'd say there's a good chance Steven Jackson does not play this week.