ASHBURN, Va. (AP) - Robert Griffin III will get more tests on his injured right knee after an MRI proved inconclusive because of a previous ACL tear.

Washington Redskins coach Mike Shanahan said Monday that the rookie quarterback will travel Tuesday to see orthopedist James Andrews for more examinations.

Griffin tore his ACL while playing at Baylor in 2009, and Shanahan said sometimes an old injury can cloud the results of an MRI.

If Griffin has torn the ACL again, he would likely require a rehabilitation period of nine to 12 months, putting his status for next season in jeopardy.

Griffin reinjured his knee twice in Sunday's playoff loss to Seattle.