PEORIA, Ariz. -- Pitcher Mat Latos, who only a week ago appeared to be the front-runner to start on Opening Day, has instead landed on the 15-day disabled list with bursitis in his right shoulder.

Latos reported soreness in his shoulder last Wednesday, and he could hardly pull on a shirt the next day. A day later, though, Latos said his shoulder was beginning to feel better.

"He's turned a corner on this thing," Padres manager Bud Black said. "The medical staff feels good about it."

The Padres have maintained that there's no timetable for Latos to return, though he's set to play catch on Tuesday in Peoria.

Latos, a 14-game winner in 2010, will be placed on the disabled list retroactive to March 22. That means the soonest he could return would be April 6, the day the Padres play the Giants at PETCO Park

Latos had a 9.00 ERA this spring in four appearances.

The Padres announced on Friday that Tim Stauffer will start Opening Day on Thursday in St. Louis, and that Aaron Harang will start the home opener on April 5.

Padres one move shy of Opening Day roster

PEORIA, Ariz. -- After a flurry of moves Monday, the Padres find themselves one roster move shy of announcing their 25-man roster for Opening Day.

San Diego manager Bud Black said he will announce the roster on Tuesday, presumably before the Padres face the Brewers in Peoria.

The Padres will open the season with four starting pitchers and eight relievers, and the final reliever to be added to the roster will be either Samuel Deduno or Luis Perdomo.

The team will fly to St. Louis late Tuesday, in advance of Opening Day on Thursday at Busch Stadium against the Cardinals.

There were a few surprises Monday, namely the inclusion of Cedric Hunter, who made the team as an outfielder when utilityman Eric Patterson landed on the disabled list.

Hunter, a third-round Draft pick by the Padres in 2006, impressed this spring, hitting .385 in 26 at-bats. He was sent to Minor League camp on March 15.

"I missed a meeting the other day, and I thought he was bringing it to my attention," Hunter said. "It's a good feeling. I feel like a little kid."

Other moves included:

• Left-hander Wade LeBlanc has been optioned to Triple-A Tucson. He'll remain in Arizona and make a start Wednesday in a Triple-A game, and he will then throw a simulated game in Tucson on April 6. The Padres don't need a fifth starter until April 12, and LeBlanc could be the one they turn to. He had a 7.78 ERA this spring.

• Catcher Rob Johnson won the backup position behind Nick Hundley. Guillermo Quiroz was reassigned to Minor League camp. The Padres wanted a strong defender to back Hundley, and Johnson is regarded as a better catch-and-throw catcher.

"Anytime you make the Opening Day roster you're excited," Johnson said. "It's a great clubhouse, the staff is incredible. I'm really excited."

• Outfielder Oscar Salazar was released. Salazar, who was removed from the 40-man roster in the offseason, hit .235 this spring in 34 at-bats.

• Infielder Jarrett Hoffpauir, first baseman/outfielder Kyle Blanks, reliever Joe Thatcher and outfielder Mike Baxter were placed on the DL. Baxter, who had thumb surgery recently, will be placed on the 60-day disabled list.

• Utilityman Eric Patterson, as expected, was placed on the disabled list, though his sore left hamstring has responded well to treatment. Patterson is able to hit, ride the bike and do some running. He'll be eligible to come off the disabled list on April 6.

• Left-hander Cory Luebke has made his first Opening Day roster. He has pitched both as a starter and reliever this spring, and will serve in a long reliever role to begin the season. Luebke has a 4.19 ERA this spring. The Padres optioned their other healthy left-hander in camp, veteran Randy Flores, to Tucson.

• Infielder Everth Cabrera was optioned to Tucson and infielder Logan Forsythe was sent to Minor League camp. The Padres acquired Alberto Gonzalez in a trade with the Nationals earlier on Monday to give them a defensive-minded middle infielder. Cabrera figures to be the everyday shortstop in Tucson. Also, outfielder Aaron Cunningham was optioned to Tucson.