The Diamondbacks will option Tawa to Triple-A Reno prior to Thursday's contest versus the Cardinals, Nick Piecoro of the Arizona Republic reports.
His roster spot will be filled by Max Kepler, who is returning from an 80-game PED suspension. Tawa has had multiple stints with the Diamondbacks this season but has played sparingly, putting up a .536 OPS across 76 plate appearances.