Wells has been taking batting practice and participating in running drills, but he might still be a week away from being game-ready.
Wells has been on the disabled list since July 10 after suffering a Grade 2 sprain of his left hamstring while stealing third base in the sixth inning of Toronto's July 9 game with Baltimore.
Gaston remembers how routine the play was that Wells hurt himself on, but Gaston has learned that injuries can occur on even the most mundane plays.
"This game is one of quick starts and stops," Gaston said.
Gaston said he had a light-hearted conversation with Wells' father, Vernon Sr., about how odd some of Wells' injuries have been.
"He told me, 'Vernon's getting the same injuries I got, but I was 35 when I got them,'" Gaston said.
TOR: RHP Roy Halladay (12-8, 2.85 ERA)
In his last start, Halladay lost to the Rays for the third time this season, allowing three runs on six hits in eight innings. He enters August having thrown at least one complete game in each month this season, and he will face the A's for the second time this year. On May 28, Oakland managed one run in eight innings against Halladay, who struck out nine en route to his sixth win of the season.
OAK: LHP Greg Smith (5-10, 4.04 ERA)
In his last start against the Royals, Smith pitched what manager Bob Geren called "one of his sharpest outings," but two pitches that resulted in home runs doomed the A's in a 5-2 loss. Smith went seven innings, surrendering the five runs on just four hits while walking two and striking out five. He also tallied his Major League-leading 13th pickoff, which is the most by a big leaguer since Andy Pettitte picked off 14 in 1997. Smith pitched 6 2/3 shutout innings on May 27 to pick up the win against Oakland. Smith's first start of the season was also against Toronto. He got a no-decision then.
In other injury news, reliever Jeremy Accardo and outfielder Shannon Stewart each continued their rehab assignments Saturday night with Class A Dunedin. Saturday was Accardo's first appearance since June 12. He's been on the disabled list since May 10 with right forearm tightness. Stewart is 5-for-12 in the first four games of his rehab assignment. He's been on the disabled list since June 8 with a high right ankle sprain. ... Gaston said third baseman Scott Rolen, who wasn't in the starting lineup Sunday, would probably get Monday off, too. ... Sunday was the first game in Rangers Ballpark in Arlington in which neither team committed an error since July 11. ... In allowing two runs in two-thirds of an inning Sunday, reliever Jesse Carlson's ERA rose from 1.80 to 2.21. ... Sunday's game-time temperature was 103 degrees.
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Official game notes
Tuesday: Blue Jays (Scott Richmond, 0-1, 5.06) vs. Athletics (Sean Gallagher, 4-4, 4.11), 7:07 p.m. ET
Wednesday: Blue Jays (Shaun Marcum, 5-5, 3.57) vs. Athletics (Justin Duchscherer, 10-7, 2.33), 7:07 p.m. ET
Thursday: Blue Jays (A.J. Burnett, 13-9, 4.57) vs. Athletics (Dana Eveland, 7-8, 4.46), 7:07 p.m. ET