The Rangers will be without outfielder Nelson Cruz for an undetermined period after he strained a left hamstring running out a double in the sixth inning. The Rangers expect to have a clearer idea of Cruz' status after he undergoes tests Monday.

Third baseman Adrian Beltre has been out for six weeks because of what the club called a strained left hamstring.

"It's a hamstring, and hamstrings usually mean time," manager Ron Washington said.

Cruz has a history of leg ailments. He missed 17 games in May because of a strained right quadriceps.

The injury came with Cruz on the verge of one of his intermittent hot streaks. He has eight hits, four for extra bases, in his last 12 at-bats.

If Cruz goes on the disabled list, the Rangers could move first baseman Mitch Moreland to right field and use Mike Napoli at first base. If the medical staff says Cruz will miss only a few days, the club will add a position player. In the current arrangement, the Rangers have only three bench players.