Grizzlies forward Darrell Arthur left practice this morning with a serious Achilles injury and the fear is that he might be lost for the entire 2011-12 season, according to sources with knowledge of situation.

An early diagnosis by the team’s medical staff indicated that Arthur might have suffered a torn right Achilles.

The 6-foot-9 reserve had just returned to practice after missing time with a sore left Achilles.