SAN DIEGO -- Padres outfielder Mark Kotsay, who hasn't played in a week because of a lower back strain, had a setback on Friday at Petco Park and is now headed to the 15-day disabled list.

The move will be backdated to Sunday, and Padres manager Bud Black is hopeful that Kotsay will need only a week or so before his back feels better.

The Padres have recalled outfielder Blake Tekotte from Triple-A Tucson. Tekotte, according to Black, is set to arrive during Saturday's game.

Kotsay was making progress toward a return after suffering the injury in Philadelphia on May 12, but he aggravated the injury during fielding drills before the Padres' game against the Angels.

"Knowing his back like he does, Kots came into the office today and said that in the interest of the club and since we're carrying 13 pitches, that it was probably best to make this move," Black said. "He felt that he couldn't play in the field the next three or four days."

The Padres now have 13 players on the disabled list, the most in the Major Leagues.

Tekotte was 0-for-3 in a five-game stint for the Padres earlier this season. He was hitting .283 with four home runs, 11 RBIs and three stolen bases for Tucson in 28 games.

Amarista adjusting to new role with Padres

SAN DIEGO -- Second baseman Alexi Amarista's recent promotion from Triple-A Tucson has been made easier by the fact that the Padres also promoted the guy who he was playing alongside, shortstop Everth Cabrera.

"It's been good. The fact we've only been playing a short time together, we communicate well, we have been playing good defense," Amarista said through a translator. "When I'm at short and he's at second or he's at short and I am at second."

These two could be paired together for a while, with Cabrera at shortstop and Amarista at second base, especially since the team has parted with second baseman Orlando Hudson and shortstop Jason Bartlett is on the 15-day disabled list.

It's certainly been an interesting month for Amarista, who was traded to the Padres along with pitcher Donn Roach on May 3 for reliever Ernesto Frieri.

"I was just surprised, to tell the truth. I wasn't expecting anything. I just got to the park and the manager called me in his office," Amarista said of the trade.

Amarista has one hit in his first six at-bats with the Padres, with one RBI, heading into Saturday's game against the Angels at Petco Park. He hit .286 in 11 games with Tucson after the trade. Amarista had a .273 average in 18 games with Salt Lake before the trade.

Amarista and Cabrera were in the starting lineup Saturday against the Angels, at second base and shortstop, respectively.

"I want to make contact as a hitter, be able to move the runners, bunt when I need to bunt, just stay on top of that," Amarista said.

San Diego manager Bud Black called his former boss, Angels manager Mike Scioscia, for some intel on Amarista and liked what he heard.

"The first thing he said was this guy can play six positions, he can feel comfortable with them anywhere, he swings the bat and he has some speed, so that versatility plays much better in the National League," Black said.

"We're going to do some things with him. Right now, we have Cabrera, Amarista and [Andy] Parrino, so he'll get his playing time. He's going to play a lot."

Darnell gets good news after MRI on shoulder

SAN DIEGO -- Finally, the Padres received some good news on the health front -- a real rarity during this trying season that has seen 13 players go on the disabled list since Opening Day.

Outfielder James Darnell, who was placed on the 15-day DL on Friday with an injured left shoulder, was told the MRI exam he had on the shoulder revealed no damage to his labrum.

"I was happy it was still intact," said Darnell, who has a partial dislocation of his shoulder after diving for a line drive on Thursday. "There are no tears, so that's really encouraging."

Darnell has a history of injury with his left shoulder, as he had surgery to repair his labrum in September. For as frustrating as this injury is, he's trying to look at the bigger picture.

"You don't want to miss time," he said, "but this is a time to get this shoulder fully healthy and strengthen it so it never happens again."

Darnell said that he's been told he'll have another MRI exam in a couple of weeks to measure progress.

At the time of his injury, Darnell was hitting .235 in 17 at-bats. He hit his only home run of the season on May 15 in Washington against Nationals ace Stephen Strasburg.