TORONTO -- Right fielder Teoscar Hernandez was held out of the Blue Jays' lineup on Thursday against the A's because of back tightness.
Blue Jays manager John Gibbons said Hernandez felt his back tighten up during Toronto's 12-1 victory over the Mets on Wednesday. In Hernandez's absence on Thursday, John Smith got the start in left field, while Curtis Granderson moved over to right.
"His back tightened up on him yesterday in the rain," Gibbons said.
Gibbons added he does not believe the injury is serious and considers Hernandez day to day. The expectation is that he will return at some point during the Blue Jays' four-game weekend series against Oakland.
Hernandez hit a two-run homer on Wednesday, and he's batting .272/.324/.560 with seven home runs and 18 RBIs in 30 games this season.

Waiting on Travis
Devon Travis' prolonged struggles at the plate have continued with Triple-A Buffalo. The 27-year-old is 10-for-49 in the Minors this season, slashing .204/.235/.286 in 11 games for Buffalo.
Gibbons said the reports he has been receiving from the Bisons indicate that Travis has been swinging the bat better than the numbers would indicate, but there is a lot of work to be done as he works himself out of the current skid.
"I heard he's swinging it better than the results you're probably looking at right now," Gibbons said. "I think it's just taking a little bit of time. ... I wasn't really looking at any timeline. The important thing is getting him going."
In 18 games this season for the Blue Jays, Travis slashed .148/.212/.246. He was optioned to Buffalo on April 29.
Saturday starter in limbo?
Gibbons appeared to indicate earlier this week that right-hander Joe Biagini would start Saturday's game against the A's. Gibbons initially confirmed that all of his starters would remain on turn, but when asked specifically about Biagini facing Oakland on Saturday, he sidestepped the question.
There were more questions about Biagini's status when the Blue Jays returned home for the Oakland series, but Gibbons once again remained vague about who would start Saturday. Right-hander Sam Gaviglio also has received some consideration for the start.
The Blue Jays might be delaying an announcement until they know how much the bullpen will have to be used in the first two games of the series. If Biagini is needed out of the bullpen on Friday, then it would eliminate him from consideration for Saturday's outing.
"We'll let you know the starter in the next couple of days," Gibbons said. "To be determined."