TORONTO -- Frequent flier Matt Olson was optioned to Triple-A Nashville on Monday, just three days after being summoned for National League play in New York, as the A's moved north of the border with an extra reliever in tow.
With the A's resuming American League play in Toronto, they opted for an eighth reliever over an extra bench player -- although Joshua Smith, recalled from Nashville, was technically the seventh man in Oakland's bullpen on Monday, with righty Frankie Montas delayed by visa issues in New York.
Montas wasn't expected to join the A's in Toronto until Tuesday, making the addition of Smith all the more necessary.
"You look at the dynamic in our bullpen right now, we're a little short as far as the length part goes," A's manager Bob Melvin said. "Sometimes, with a four-game series, you might need someone to give you not only a couple innings but more than that, and he's able to do that."

Olson's latest stint, which included just two at-bats, was his fifth with the A's this season.
"I'd like to have an extra bench player, and we love having Matt Olson here," Melvin said. "The fact he can play both first and the outfield lends to him being here when we need an extra player, but we're back to eight and a little beat up as far as our bullpen goes today."
Smith joins the A's for a second time this year, having posted a 6.75 ERA across 24 innings in 18 games following his first promotion May 3. He allowed just one earned run over his first eight innings but 17 in his final 16 frames before being optioned July 1.
Worth noting
• Rehabbing right-hander Kendall Graveman (shoulder) made his second rehab start with Nashville on Monday, throwing 65 pitches in three innings. He allowed three earned runs (seven total) on nine hits and one walk with one strikeout.
Melvin expects Graveman to make at least one more rehab start before potentially rejoining the A's rotation.