ARLINGTON -- Catcher Matt Treanor ran the bases prior to the Rangers' game against the Yankees on Tuesday and called the results "outstanding."

Treanor, who went on the disabled list July 24 with a strained posterior cruciate ligament, was pleased with the work he got in as he continues inching toward a rehab assignment. He said he'd likely have a better idea on when he'd go out on assignment at the end of the week.

"Blocking, some footwork, see how I am coming out of the catcher's stance," Treanor said of what he worked on. "I hit on the field the last day in Oakland. I don't know if I hit on the field today, but I'll hit in the cage, for sure."

He noted that his injury definitely entered his mind as he crossed first base. Treanor was originally injured after tripping over the foot of Angels first baseman Kevin Frandsen before falling to the ground.

"It's there. It's not going anywhere," Treanor said of the first-base bag. "The more work I get, the less it enters into my mind. There's a reason I'm running the bases and not going with the club and all that other stuff. It's hard not to know about it."

Whenever he does return to the Rangers, he'll do so wearing a new number. Treanor gave his usual No. 15 to the newly acquired Cristian Guzman, who has worn the number throughout his career. Treanor, meanwhile, will switch to No. 20.

"It worked out for me, because I've worn 20 quite a bit. I wore it in memory of my brother," Treanor said of his brother Michael, who passed away in December 2002. "He was a big baseball fan and he always wore 20. So when I had a chance to actually ask for a number after my second year here in the big leagues, I figured I'd put that on."

Kinsler's MRI reveals lingering inflammation

ARLINGTON -- If the Rangers were in postseason play right now, second baseman Ian Kinsler would be in the lineup despite a strained left groin muscle.

But the Rangers still have 50 games to play and Kinsler is going to be on the disabled list for awhile longer. He could be there until the rosters expand on Sept. 1.

Kinsler underwent an MRI on Tuesday and the results showed he still had some inflammation in the groin area. Kinsler also tested the injury with some light jogging and still felt some discomfort.

Kinsler, who was examined by Dr. Keith Meister on Tuesday, is reporting significant improvement and will begin to do more baseball activities. But he is probably at least a week away from resuming batting practice.

"If we were in the postseason, he could play," general manager Jon Daniels said. "But right now there are two-plus months to go, so we're going to treat it cautiously. We want to make sure it's 100 percent or as close to that as possible."

Kinsler, who could come off the disabled list as early as Friday, will also likely need a rehab assignment in the Minor Leagues. He hasn't played since July 27 against the Athletics.

"Realistically we're looking closer to the end of the month," Daniels said. "We can't rule out Sept. 1, but right now we're taking it step-by-step."

Headaches a thing of the past for Nippert

ARLINGTON -- Rangers pitcher Dustin Nippert said he's finally over the headaches that had been causing him trouble since he landed on the disabled list.

"The dizzy spells and the headaches and stuff like that lasted a lot longer than I thought they would," Nippert said. "But they're gone now, so hopefully they'll stay away. I just have to start conditioning and try to get back to normal as fast as possible."

Nippert was hit in the head by a line drive July 19 in Detroit and has been on the DL since. He was eligible to come off Aug. 4, but remained sidelined because of the headaches.

"I feel really good. I'm pretty much back to normal now," Nippert said. "I just have to catch up, conditioning-wise and with arm strength, but other than that, I feel really good."

Rangers manager Ron Washington said it means a lot to see Nippert throwing again.

"He took a few chances to work his way back and it didn't work. Now he's back in there throwing and doing good," Washington said. "That was scary. It didn't glance off his head, it hit him solid. I'm glad he's back to baseball activities for his peace of mind. That was scary."

Nippert said he isn't sure when he may come off the disabled list, but felt he could have a better grasp on Friday or Saturday.

"I took it easy throwing today. I had long-toss yesterday, long-toss again tomorrow," Nippert said. "And then hopefully I'll finish off the mound or finish with the flat ground. We'll see how I feel tomorrow but that's the plan. After that, we'll take it day-to-day and see where it leads."

Rangers push back Harden's next start

ARLINGTON -- The Rangers are pushing Rich Harden back in the rotation.

They aren't sure how far back they're pushing him, but it will be at least one day.

With the way the Rangers' rotation is set up now, Harden's next start falls on Saturday against the Red Sox. But the Rangers are moving Colby Lewis ahead of Harden and he'll pitch on Saturday.

Harden last pitched on Saturday against Oakland with Lewis following him the next day. Now Lewis is going ahead of Harden.

In his last start against the A's, Harden lasted only 2 1/3 innings, giving up three runs on two hits with five walks. His ERA for the season is 5.45.

"I just want to get Colby in there," manager Ron Washington said.

Harden could pitch Sunday or the Rangers could bring C.J. Wilson back on his normal rest. Cliff Lee is scheduled to pitch Monday in the first of a three-game series against the Rays in St. Petersburg, so Harden could get pushed back to Tuesday.

Worth noting

Rangers manager Ron Washington decided to go with veteran Jorge Cantu against A.J. Burnett on Tuesday at first base, but the skipper said Mitch Moreland will start on Wednesday. ... On the Rangers' recent road trip, Elvis Andrus hit .364 (12-for-33) and David Murphy hit .344 (11-for-32) while all other Rangers hit a combined .201 (48-for-239). ... Darren O'Day enters this homestand having logged 25 consecutive scoreless innings, which is the longest active streak in the Majors and the fourth-longest by any player in 2010. ... The Rangers are 37-23 with a .290 batting average with Ian Kinsler in the lineup and just 27-24 with a .255 average when he's out of the lineup. ... The Rangers' 3.07 ERA since the All-Star break is the second best in the Majors, behind only the Athletics (2.90 ERA).