PHOENIX -- San Diego skipper Bud Black said Wednesday that he was pleased with rehabbing pitcher Chris Young's first game action since since May 2 and outlined the next step in Young's long recovery process.

Young allowed a home run, but retired the final eight batters he faced in a three-inning start for Triple-A Portland on Tuesday night. He threw 31 pitches (24 strikes) and was on a 50-55 pitch count.

"I like that he threw strikes," Black said.

Young, on the 60-day disabled list since April with a strained right shoulder, will be limited to four innings or 45-60 pitches in his next Minor League rehab start, which could be for either Portland or Class A Lake Elsinore.

Black said that because the Minor League season will end before Young is ready for the Majors, the veteran right-hander could make an appearance in Arizona's Rookie-level instructional league.

As for whether Young, whose contract calls for an $8.5 million club option in 2011, could return in time for the postseason, Black tempered his enthusiasm.

"I think it's unfair to place any expectations on C.Y. moving forward," the manager said. "He's been out a long time, and he's done a lot of work on his shoulder."

Padres call up four players to big leagues

PHOENIX -- The Padres added four players to their roster on Wednesday, as Major League clubs were allowed to expand from 25 to 40 active players. The promotions included pitchers Cory Luebke, Ryan Webb, outfielder Oscar Salazar and catcher Chris Stewart.

Manager Bud Black said there could be a "few more additions," as his club, four games up on the Giants in the National League West race entering play Wednesday, prepares for the stretch run. The candidates to be called up include outfielder Luis Durango and recently demoted relief pitcher Luis Perdomo.

Webb (3-1, 3.23 ERA in 41 games) was a victim of a roster crunch, not his own failures at the Major League level. The Padres optioned him to the Minors twice this month, to reinstate from the 15-day disabled list fellow reliever Mike Adams on Aug. 7 and second baseman David Eckstein two weeks later.

"Hopefully this will be the last time I'm called back up," said Webb.

Webb said he used his 17 appearances at Triple-A Portland, where he was 1-0 with a 0.87 ERA, to polish his changeup, a pitch he was hesitant to use against Major League hitters.

"It was a good time for me to work on things that you can't work on or don't want to when you're having success up here," he said, "so you go down and try to get even better."

The rookie right-hander said he now feels more comfortable mixing in the change-of-pace pitch with his fastball, slider and curveball.

"If everybody is sitting on something hard," Webb explained, "they're comfortable at the plate, so anything that makes the hitter less comfortable you can use as an advantage."

Stewart, meanwhile, had planned to meet the Padres for their weekend series in San Diego. Yorvit Torrealba's balky back had another idea.

With Torrealba day-to-day, Stewart joined the Padres before Wednesday's 5-2 loss to the D-backs. He was available off of the bench while Nick Hundley caught and hit sixth.

The 28-year-old Stewart, who previously made big league appearances with the Rangers, White Sox and Yankees, said that because he wasn't on San Diego's 40-man roster, he didn't expect the call up.

"It was a welcomed surprise for sure," he said.

Stewart batted .248 with seven home runs and 39 RBIs in 85 games for Triple-A Portland. He gives the Padres a third catcher.

"If they have to pinch-hit for a [catcher] earlier in the game ... [and] that second guy gets injured. It makes [Black's] managing more flexible, and hopefully I can help out in more ways being the extra guy just in case."

To clear a 40-man slot for Stewart, the Padres designated for assignment right-handed pitcher Cesar Carrillo, who had spent the entire season at Triple-A Portland.

Worth noting

Well before Wednesday's game against the D-backs, a contingent of Padres were watching Eddie Murphy's 1988 flick "Coming to America," in Chase Field's visiting clubhouse -- until, that is, an MLB Network TV replay of Reds pitcher Aroldis Chapman came on a second screen. Arguments ensued over the accuracy of the radar guns reading Chapman's fastball at more than 100 mph. ... The Padres announced postseason All-Star honors for its Minor League squads. Those recognized included Class A Lake Elsinore pitchers Brad Brach and Anthony Bass, Fort Wayne's Jason Hagerty and Eugene's Emmanuel Quiles. Elsinore's Carlos Lezcano and Dave Rajsich were named manager and coach of the year, respectively.