ANAHEIM -- When the Angels depart on a six-game road trip through Detroit and Houston, a trio of injured relievers will report to Arizona for treatment.
Sean Burnett (left elbow impingement), Robert Coello (right shoulder inflammation) and Ryan Madson (recovering from Tommy John surgery) will all go to extended spring camp to continue their rehab.
"It's better for them, which is ultimately better for us," Angels manager Mike Scioscia said.
Burnett, a left-hander, and Coello, a right-hander, will simply receive treatment. Neither is expected to throw a baseball for "a while," according to Scioscia.
While in Arizona, Madson will continue to play catch off of flat ground. It still remains to be seen when he will get back on a mound.
Since his Tommy John surgery on his right elbow in April 2012, Madson's recovery has taken a plethora of twists and turns.
Although the Angels still have a glimmer of hope, Scioscia admitted that Madson may not pitch for the club in 2013.
"As the calendar turns, it becomes more of a possibility," Scioscia said. "I know Ryan's frustrated. It's definitely frustrating for us, especially since he was virtually ready -- so close. One more tuneup rehab start and he never got to that rehab start; he was shut down."
Bourjos day to day after injuring left thumb
ANAHEIM -- Peter Bourjos left Sunday's finale vs. the Pirates prior to the fourth inning with a left thumb injury.
Bourjos appeared to have hurt the thumb on a takeout slide into second base during the second inning.
Brad Hawpe entered the game for Bourjos, but in right field. J.B. Shuck slid over to left and Mike Trout assumed center-field duties.
Bourjos underwent precautionary X-rays after the game, the results of which the Angels were awaiting.
Scioscia hopes to see improvement vs. southpaws
ANAHEIM -- The Angels have struggled in multiple facets of the game throughout the 2013 season, and hitting against left-handed pitchers is one of those areas.
Through the first 75 games, the Angels were hitting at a .229 clip against left-handers, compared to .279 against righties.
"I think, early, we struggled," Angels manager Mike Scioscia said. "There are some guys, against left-handed pitching, that aren't as locked in."
Just a season ago, the Angels' splits were nearly identical, as they hit .277 against southpaws and .273 against right-handers.
The Angels have faced a left-hander in two of their last four games, and the results have not been favorable.
On Saturday, the Pirates' Francisco Liriano limited the Angels to one earned run in 6 2/3 innings. On Wednesday, Seattle's Joe Saunders gave up one run in eight innings.
A week ago, CC Sabathia gave up two runs in eight innings.
While Scioscia feels the team has "picked it up a little bit" against left-handers, the Angels are still four games under .500 (8-12) when facing a left-handed starter.
"I think we have balance in our lineup that should be able to get it done against whoever's pitching," Scioscia said. "Hopefully we'll get a little more offense going against lefties."
• Alberto Callaspo has made seven errors in June after having just one in the first two months of the season. Callaspo is typically a strong defensive third baseman, but Scioscia believes the slump is something that happens to every player and that Callaspo will come out of it.
"You're always going to have some issues where you're not full go, and right now, on the defensive side, there have been some plays the last couple weeks that he will make, he just hasn't gotten it done," Scioscia said.
William Boor is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.