Posted by ESPN.com's Bill Williamson
On Wednesday morning, the Broncos discovered that Torain had suffered a PCL strain in his right knee.
He had stayed healthy for the first 16 days of training camp. Torain, who was fighting for a roster spot, is expected to be out for the rest of the preseason.
A fifth-round pick last year, Torain was plagued by injuries at Arizona State. He suffered a left elbow injury in training camp last season that kept him out for three months and then he tore the ACL in his left knee in his first significant action during the regular season.
Denver signed running back Marcus Thomas on Wednesday. The team did not announce a corresponding roster move. If a move is being made on Torain, options include him being put on injured reserve or being waived/injured. I will give updates as the story developments.