ANAHEIM -- A day after Garrett Richards left his start against the Rangers after just two-thirds of an inning, the Angels placed him on the 15-day disabled list with a right groin strain.

The Angels also optioned infielder Andrew Romine to Triple-A Salt Lake and called up pitchers Trevor Bell and Horacio Ramirez. The Angels were trying to reinforce a bullpen that was needed for 8 1/3 innings on Monday night after Richards left the game. The Angels also had rookie Tyler Chatwood on the mound on Tuesday.

"Trevor is here to give us a little bit of length," Angels manager Mike Scioscia said. "We went through almost nine innings in our bullpen. If we need length, he can give it to us. With him and Horacio, we need them just in case Tyler struggles."

Ramirez was 3-1 with a 3.40 ERA in 40 appearances (one start) for the Bees and had an 11.25 ERA in five games for the Angels earlier this season. He has pitched in 162 Major League games, including 105 starts, from 2003-11.

Bell was 2-3 with a 5.97 ERA in seven starts and one relief appearance at Salt Lake and had a 3.24 ERA in 15 relief appearances for the Angels earlier this season. He started the season at Salt Lake, was called up on April 22 and optioned back on July 21.

Richards was making his second Major League start when he strained his muscle in the first inning on Monday night against the Rangers.

"It is just something that could happen to anyone," Richards said. "I am disappointed. I didn't have any discomfort last night while I was sleeping or anything. I woke up this morning and it feels a lot better than it did yesterday, which is good. I'm able to walk around with no discomfort. It is just a little sore."

The Angels are still waiting on some tests to come back before they know the full extent of the injury.

"But an injury like that is going to be a couple of weeks to get it calmed down and then testing it again," Scioscia said.

Pineiro back in rotation for start on Saturday

ANAHEIM -- With Garrett Richards going on the disabled list, the Angels are putting veteran pitcher Joel Pineiro back in the rotation. He pitched three scoreless innings with three strikeouts in Monday's 8-4 loss to the Rangers.

Pineiro, who will take Richards' spot on Saturday against the Orioles, has been working with pitching coach Mike Butcher on some mechanical adjustments. The main point was shortening his stride to the plate.

"It was getting a little long," Angels manager Mike Scioscia said. "Butch has worked hard on it with him since he was moved. Last night, maybe two pitches got away from him, but the rest were right there."

Pineiro, who missed the first month of the season with tightness in his right shoulder, was 5-6 with a 5.31 ERA as a starter. He was 0-3 with a 14.85 ERA in four starts after the All-Star break before being moved to the bullpen.

Monday was the first time he has made it through a game without allowing a run since May 5. He threw 5 2/3 scoreless innings in an 11-0 victory against the Red Sox in Fenway Park.

"I have been feeling the same as I have when I was starting," Pineiro said. "The only thing I have told myself recently is to be aggressive and think every pitch is my last. The confidence has always been there, and maybe that [Monday's outing] is something they needed to see. It was a great feeling."

Worth noting

• Former Angels manager Buck Rodgers threw out the ceremonial first pitch before Tuesday's game. He was also on the Angels' original expansion roster and their Opening Day catcher from 1962-68. Former Angels shortstop Gary Disarcina will do the honors on Wednesday night.

• The Angels, going into Tuesday, had homered in eight straight games, their longest streak of the season. They are 43-26 in games in which they have hit a home run.

• Russell Branyan's home run on Monday was his sixth as a pinch-hitter. That's tied for the ninth most by a pinch-hitter in the Major Leagues. Two of those have come this season for the Angels.