The signing is a "done deal" according to Chris Russel, Redskins beat reporter for 106.7 FM THE FAN who related the news on The Mike Wise Show this afternoon.
There are no other media reports about the Redskins and Mason yet, but the team has a clear need at running back. The Redskins reported on their Web Site that Ladell Betts and right guard Chad Rinehart are lost for the remainder of the season.
Starting running back Clinton Portis is expected to miss the game with Philadelphia.
Mason continues to be a local favorite but was unable to stick with with the team. Washington's coaches have been concerned with Mason's blocking abilities and his overall fit on special teams. He was released in October to create roster space for tackle Levi Jones.
But man, can Marcus run.