The Reds optioned Martini to Triple-A Louisville on Tuesday.
Martini went 0-for-4 in Wednesday's 6-2 loss to San Diego.
Martini is not in the lineup for Monday's game versus Milwaukee.
Martini is out of the lineup for Sunday's game against the Mets.
Martini started at designated hitter and went 1-for-4 with an RBI and a run scored in Wednesday's 4-1 win over the Phillies.
Martini is out of the lineup for Monday's game against the Phillies.
Martini will serve as the Reds' designated hitter and No. 8 batter in Thursday's season opener versus the Nationals.
Martini was told he made Cincinnati's Opening Day roster, Mark Sheldon of MLB.com reports.
Martini started at first base and went 1-for-3 with a two-run home run in Saturday's spring game against Arizona.
Martini is out of the lineup for Monday's game against the Twins.