Oswalt to throw bullpen session on Tuesday

Oswalt to throw bullpen session on Tuesday

Oswalt to throw bullpen session on Tuesday

ATLANTA -- Right-handed pitcher Roy Oswalt, coming back from a hamstring injury he sustained on July 7, will throw a pitch bullpen session at Turner Field on Tuesday, then plans to face hitters in a simulated game when the Rockies travel to Pittsburgh this weekend.

If all goes well, Oswalt will begin a rehab assignment with an eye toward returning to the Majors after a couple of starts. Oswalt signed with the Rockies in May and joined the team on June 20, going 0-4 with a 7.64 ERA in four starts. He struggled to regain his timing on secondary pitches, but felt he was progressing before the injury.

"He's progressing nicely," said Rockies manager Walt Weiss, who said he isn't sure when Oswalt will be fit to return. "He's progressing well beyond where we thought he would be. We're just going to keep giving him a little bit more as we move forward."

Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.