Keene (knee) was a limited participant in Friday's practice, Zack Cox of NESN.com reports.
Keene was spotted with a large brace on his left knee during Friday's practice. He's trending in the right direction after sitting out last week against the Bills, but there's a good chance that he's handed at least a questionable tag following Saturday's practice. The rookie third-rounder has played just one game this season, and Ryan Izzo (hamstring) is the only other tight end on the active roster.