Chambers was injured in the 34-7 victory over Buffalo when a defensive player landed on him at the end of a 36-yard reception late in the first quarter.
Chambers sat out the rest of the game, although Wannstedt said afterward that Chambers was telling the coach he would have been able to get back in the game.
The Dolphins sent an intern from the training staff home with Chambers earlier this week, and the rookie wideout has been getting treatment on the ankle all week.
It's pretty obvious by now that the Dolphins clearly need Chambers against the Ravens.
The good news out of Dolphins camp on Thursday is that Chambers was the only player who didn't practice, and word is that Zach Thomas is pretty close to full speed, if he's not already there.