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7/27/2013 6:45 P.M. ET

Grossman likely to play different role with Astros

TORONTO -- Outfielder Robbie Grossman, who was called up from Triple-A Oklahoma City after J.D. Martinez was placed on the disabled list Friday night, figures to play a different sort of role than he did when he was the everyday starter in center field for a month earlier in the season.

Manager Bo Porter said Grossman would see some time in center and the corner-outfield spots, but it will depend on how well he can swing the bat. Grossman was hitting .281 at Oklahoma City, but batted just .198 (22-for-111) in his time with Houston earlier this year -- which included 28 starts.

"He's put up good numbers at Triple-A, and has been swinging the bat well," Porter said. "If he can get up here and give us an offensive spark, he'll play."

"I made a couple of adjustments, and [they] paid off for me down there," Grossman said. "I'm looking forward to building off of that."

Meanwhile, Martinez headed back to Houston on Saturday to get his sprained left wrist examined by team doctors. Martinez injured the wrist sliding into second base in the sixth inning of Friday's 12-6 loss to Toronto, a game in which he had two hits.

Porter said the extent of the injury isn't known.

"I'm not going to play doctor," Porter said. "We'll let him see the doctors and let them tell us exactly what it is."

More changes may be in store for Astros' bullpen

TORONTO -- Don't be surprised if the Astros make more moves in the coming days to try to fix their bullpen. Manager Bo Porter said on Saturday the bullpen's recent struggles are "frustrating for everybody," and that includes general manager Jeff Luhnow.

Porter and Luhnow spoke on the phone following Friday's game because they had to make a roster move and put J.D. Martinez on the disabled list, but Porter said Luhnow has echoed some frustrations, as well. Houston's bullpen has allowed at least one run in 10 consecutive games (since July 13), posting an 8.01 ERA over that span, and has given away several late leads.

"He's just as frustrated as I am," Porter said. "It's one of those things where, again, you look at the options we have down there and those are the guys that are going to get the ball. It hasn't been good. That's just point blank. That's the best way I can put it."

Porter hinted changes could be made if the bullpen doesn't show signs of improvement.

"I think it's pretty obvious to everyone that they need to do a better job," said Porter. "This is a production-driven business. The longer you go without doing a good job, sooner or later somebody is going to have your job. If it doesn't bother you, then something is wrong with you. If you're asking me does it bother me? Of course, it bothers me.

"But, at the same time, I have a job to do to lead this team, and I can't be more point blank and clear than I've been. It's up to them to do a better job, and it's up to us to give them enough opportunity to where if they're not going to do a better job, then we need to go in another direction and find somebody else."

Brian McTaggart is reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.