The Boston Celtics announced that guard Payton Pritchard has a MCL sprain in his right knee and expected to return to on-court activities in approximately two weeks. An MRI conducted yesterday on the rookie guard out of Oregon revealed the Grade I sprain of his right MCL. Through his first 14 games, Pritchard has averages of 7.7 points, 2.6 assists and 2.4 rebounds in 20 minutes off the bench.