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7/25/2014 11:06 P.M. ET

Teixeira progressing, feels return coming soon

NEW YORK -- First baseman Mark Teixeira was not in the Yankees' starting lineup again on Friday, but he is optimistic that his return is coming soon.

Teixeira has been out of the lineup since Monday, after an MRI revealed a mild strain of his lower left lat. He had been receiving treatment all week and rested until Friday, when he participated in some slow rotation exercises, and he is expected to do the same Saturday.

"Today was, I think, the best day," Teixeira said before the Yankees' 6-4 win Friday. "I feel good with where I am, but now, since I've been shut down for so long, we have to kind of take it easy the next few days and hopefully progress to taking full swings here soon."

Brian McCann has filled in as the team's primary first baseman while Teixeira is out and Kelly Johnson is on the DL (left groin).

Teixeira hoped that if he could swing a bat for the first time since the injury on Friday that he could return to the lineup as early as Sunday. But manager Joe Girardi said after Friday's game that a return that soon is unlikely.

"I don't think that's probably realistic," Girardi said. "Because he's going to have to take some BP first. He is getting better. That's the good thing."

Capuano 'excited' to be in Yankees' rotation

NEW YORK -- Chris Capuano, the Yankees' newly acquired left-hander, will be inserted into the rotation and make his first start for his new team on Saturday against the Blue Jays.

Right-hander Shane Greene was originally scheduled to make the start but will be pushed back to Sunday; right-hander Chase Whitley will now pitch out of the bullpen.

"We're going with a guy that has a little bit more experience," manager Joe Girardi said. "Doesn't mean that Chase won't have any more starts for us. … It gives us the opportunity to use our bullpen a little bit different, too."

Whitley has been inconsistent in his rookie season, going 4-3 with a 4.60 ERA, but struck out six in six scoreless innings in his last start against the Rangers. He will almost certainly shatter his career high of 91 innings in a professional season -- entering Friday, he had thrown 87 between the big leagues and Triple-A in 2014 -- and the Yankees are not sure how he will respond to the extra wear on his arm.

Capuano started this season with the Red Sox, and went 1-1 with a 4.55 ERA in 28 relief appearances before being released. The Rockies signed him as a free agent on July 4 and he made four starts in the Minors before being acquired by the Yankees on Thursday in exchange for cash considerations.

"If you had told me about 25 hours ago, I wouldn't have believed you," Capuano said about pitching for the Yankees. "The original plan was to be pitching in Colorado this weekend. I found out last-minute yesterday that I was going to be pitching here, and I couldn't be more excited about it."

Capuano joins right-hander Brandon McCarthy, left-hander Jeff Francis and third baseman Chase Headley as new additions to the team this month, as the Yankees attempt to improve the club for a push to the postseason.

"We're confident that he can pitch extremely well for us and help us out," Girardi said.

Jamal Collier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.