Both will return to the A's when rosters expand Monday.
For Scribner, this is his fourth stint with the A's this year -- ninth over the last two seasons -- and he is 1-0 with a 1.69 ERA in six relief appearances over that span. He's also 4-1 with a 3.06 ERA and 16 saves in 40 relief outings for the River Cats.
"He's pitched in any number of roles for us," said manager Bob Melvin. He's been here with us, he knows the up-and-down thing, we can use him for length and he has done a nice job for us."
At least for Thursday, Scribner was to fill Dan Otero's role, after the righty tossed 38 pitches in earning his eighth win of the season in Houston on Wednesday.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.