"The Rangers will keep a close watch on ailing third baseman Adrian Beltre as he tries again to return from a strained left hamstring.

Beltre will accompany the club on a three-city, 10-game trip that begins Friday night against Oakland. Manager Ron Washington said the club wants Beltre on site so it can monitor and determine the pace of his rehabilitation program.

On Saturday, Beltre aggravated the injury during a running drill at Rangers Ballpark in Arlington. Beltre had been scheduled for a day off, but he pushed the club to let him work out on two consecutive days with the goal of returning to the lineup. Beltre has been unavailable for comment since that day, but he previously acknowledged being impatient.

The latest setback could keep Beltre out until September. The Rangers will cautiously treat Beltre because another aggravation of the injury could end his season."