It's there where Pennington will continue a rehab stint this week, despite going a combined 3-for-7 with two walks and a stolen base in two starts at shortstop for the River Cats over the weekend.
"He'll probably play there the next three days, and then we'll see where we're at with him," manager Bob Melvin said Monday.
Melvin noted over the weekend that he'd like to bring back Pennington at a time when he's swinging well, given his season-long struggles. At the time of his left elbow injury, he was batting just .197 with a .259 on-base percentage.
In his stead recently, Eric Sogard and Adam Rosales have been sharing time at shortstop, going a combined 9-for-41 (.220). It's unknown whether Pennington will join the A's for their six-game road swing through Chicago and Kansas City beginning Thursday, though Melvin said, "I think anything's a possibility."