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06/10/12 7:00 PM ET

Santos, McGowan hit rehab roadblocks

ATLANTA -- A pair of injured Blue Jays right-handers suffered setbacks as they were rehabilitating their injured shoulders at the team's Minor League complex in Dunedin, Fla., manager John Farrell said.

Closer Sergio Santos, who has been out since April 21 with inflammation in his right shoulder, threw a bullpen session on Wednesday and was scheduled to throw another on Saturday. But Farrell said Santos felt discomfort after Wednesday's bullpen, forcing the Blue Jays to alter his schedule.

"Because of that discomfort, which can be normal for a guy ramping back up, we've had to slow him down," Farrell said.

Starter Dustin McGowan has been out all season as he recovers from multiple shoulder injuries and also had his schedule slowed down. McGowan resumed throwing on flat ground in early May, but continues to feel tightness and discomfort in his shoulder.

"When he's able to even get to the mound is undetermined at this point," Farrell said.

Farrell said there was no timeline for either Santos or McGowan's return.

Encarnacion gets outfield start

ATLANTA -- With the Blue Jays' offense averaging 2.7 runs during their three-game losing streak entering Sunday, manager John Farrell wanted to do all he could to put together the best lineup for their series finale against the Braves.

That desire led to Edwin Encarnacion making his first appearance as an outfielder in the Major or Minor Leagues. Encarnacion has mostly played third base during his eight-year Major League career and has primarily been the Blue Jays' designated hitter this season. He replaced regular left fielder Rajai Davis.

The move allowed Farrell to use first baseman David Cooper, a left-handed hitter, against Braves right-hander Julio Teheran.

"[I] wanted another left-handed bat in the lineup, and David has been very productive since he's come up," Farrell said about Cooper before the game. "Trying to get as much offense in the lineup as possible, and if Ricky [Romero is] on his game, likely he'll just put the ball on the ground."

While the Blue Jays had one of their best offensive days of the season, beating the Braves, 12-4, Cooper wasn't much of a factor. He went 0-for-3 with a strikeout before Davis came into the game as a defensive replacement in left field and Encarnacion shifted to first base.

Before the change, however, Encarnacion held his own in left field. He made two catches, both in the bottom of the fifth inning -- even going back to the wall to track down a deep fly ball.

"Edwin has worked hard at it, even though today is the first exposure during the regular season that we've given him in left field," Farrell said. "He handled it fine."

Davis left Saturday's 5-2 loss with a blister on his left index finger, but showed no ill effects in the three innings he played on Sunday. He went 1-for-2 with an RBI.

Worth noting

• The Blue Jays have lost eight straight games to the Braves, a streak that dates back to 2009. All eight games have been at Turner Field, where the Blue Jays are hitting just .227 in 16 games since the stadium opened in 1997.

• Right fielder Jose Bautista entered Sunday's game with a season-high eight-game hitting streak. He extended his streak in each of the last two days with home runs, raising his season total to 17.

Teddy Cahill is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.