ARLINGTON -- Rangers outfielder Nelson Cruz will be sidelined for at least three weeks with a Grade 1 strain of his left hamstring. General manager Jon Daniels said the Rangers will likely call up outfielder Leonys Martin from Triple-A Round Rock on Tuesday.

"I expect we'll fill from within, with Leonys likely to get a look," Daniels said. "As for how often he'll play, that's up to [manager Ron Washington], and as we know, he'll play whoever gives us the best chance to win. We feel Leonys has the ability to fill a role, but let's see how it plays out."

Martin, who was signed as an amateur free agent in May after his defection from Cuba, is hitting .295 with four home runs and 42 RBI in 73 Minor League games. He has 53 runs scored, 19 stolen bases, a .362 on-base percentage and a .421 slugging percentage.

He will give the Rangers five outfielders, including four who are left-handed hitters. The others are Josh Hamilton, David Murphy and Endy Chavez. Craig Gentry is a right-handed hitter.

"He's talented, though not a finished product, and the time up here can only help," Daniels said. "We're a little heavy on the left side in the outfield, but those are our best guys at this point, so that's who we're going with."

The Rangers have apparently decided against activating third baseman Adrian Beltre until after his medical rehabilitation assignment. He has been on the disabled list with a strained left hamstring and joined Round Rock on Monday night in Omaha. The Rangers will likely wait until Thursday, when the rosters expand, before they activate him.

There was a flurry of rumors that suggested the Rangers would pursue outfielder Lance Berkman, and club president Nolan Ryan said in a radio interview that he might be somebody worth considering. But club sources said that wasn't going to happen.