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8/21/2014 1:52 P.M. ET

Corporan nursing lingering thumb injury

NEW YORK -- Astros catcher Carlos Corporan has spent the last two months dealing with a swollen and bruised right thumb, which has been affecting him behind the plate and swinging the bat, especially from the left side of the plate.

Corporan jammed the thumb trying to block a ball with his bare hand in mid-June against the Rays in St. Petersburg. He's been trying to put extra padding on his thumb and has been holding the bat in different ways to take pressure off the hand.

"It's been hurting," he said. "Just the fact I don't play every day, it's something you have to keep treating and then take care of. I'm just trying to forget about it and perform the best I can."

Because he plays two or three times a week as the backup to Jason Castro, Corporan is able to play through the injury. Had he been the starting catcher, he might have had to go on the disabled list and let it calm down.

"I'm trying to do my best and take some medicine and try to get the best treatment I have for my thumb," he said. "The [training staff] has been doing a pretty good job. They've kept me in the lineup, avoiding the DL."

Qualls doesn't expect DL stint for stiff back

NEW YORK -- The Astros used Jose Veras to close out Wednesday's 5-2 win over the Yankees because Chad Qualls was dealing with a stiff lower back, and Qualls said Thursday he was likely going to need another day to get healthy.

Qualls said his back had been a little tight for the past week, but he really felt it grab him while throwing a pitch to Brett Gardner in the ninth inning Tuesday.

"Fortunately, I was able to get through that at-bat and get the last out," he said. "It's done it the past couple of years, once or twice a year, and it's usually a day-to-day thing and nothing too major. We're doing treatments on it, and we'll just keep seeing how it feels each day."

Qualls didn't tell the team he wasn't available to pitch Thursday, but he hinted another day of rest could do him some good.

"That's what I would hope for," he said. "Veras did a great job last night, our bullpen has been throwing the ball well, and I take pride in being able to take the ball for the majority of my career whenever possible, so when little things like this pop up, I don't like not being available.

"I've only been on the DL one time when I blew my knee out [in 2009]. It's definitely not a DL thing. I take pride in being available every day, so I don't like being day to day. I like taking the ball. It's just frustrating. It pop ups here and there, but honestly it's not that big of a deal."

Brian McTaggart is a 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.