Patriots' left guard Logan Mankins suffered a sprained MCL in Saturday's game against the Dolphins, league sources confirm to the Globe.
Mankins made his first career start at left tackle in the game, after Matt Light's ankle injury flared up and he was unable to go against the Dolphins.
But Mankins played for only a quarter before suffering his knee injury; the Pats require all offensive linemen to wear knee braces, which may have saved him from suffering a more serious injury.
The hope is that Mankins will be healthy enough to play in the Pats' first postseason game, which will be either Jan. 14 or 15.
If, as is very likely, Mankins misses this Sunday's finale against the Bills, it will be the first time in his career that he'll miss a game due to injury.