Oakland outrighted Thomas to Triple-A Las Vegas on Wednesday, Melissa Lockard of The Athletic reports.
Spenser Watkins and Conner Capel have also been pushed off the 40-man roster as the Athletics prepare to make some September call-ups. Thomas, 28, is a career .250/.308/.333 hitter in 78 plate appearances at the major-league level.
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Athletics' Cody Thomas: Returns to minors
Rotowire
Thomas was optioned to Triple-A Las Vegas on Monday.
Thomas spent more than a month with the big club and held his own when out there, but he started only four games for the A's after the calendar flipped to August, so he will head back to the minors and presumably see action more regularly.
