The Redskins’ offensive line suffered its second blow of the season. Starting left guard Kory Lichtensteiger underwent arthroscopic surgery on his right knee and likely will miss the entire preseason.

Lichtensteiger tore the ACL and MCL in that knee last season, but coach Mike Shanahan said an MRI revealed no issues with that part of his knee. However, Shanahan said doctors saw loose particles in Lichtensteiger’s knee and wanted to take care of it now. Shanahan said he’s hopeful that Lichtensteiger will return for the Sept. 9 season opener at New Orleans.

“In talking to the doctors they thought it was smart to clear those particles out rather than wait a week or two,” Shanahan said. “You have to be very patient with Kory because you don’t want to lose a player for the season. When you do have loose cartilage like that and it’s this time of the year I’ve waited too many times for a week or two weeks and all of a sudden you go in there before the first game…. Why not do it right now to make sure it’s OK.”

Starting right tackle Jammal Brown (hip) has not practiced yet and will have an MRI Tuesday in New York.

Maurice Hurt replaced Lichtensteiger today and likely will stay there throughout the preseason, with rookie third-round pick Josh LeRibeus taking snaps there as well. Tyler Polumbus replaced Brown.

As far as adding another player capable of helping, Shanahan said, “Those guys aren’t out there. If they were out there and we thought someone was better than the people we had we would try to get those players.”

Also, Shanahan said reserve linebacker Jonathan Goff tore his ACL – the same one he tore last September – and will miss the season.