The Athletics claimed Rashi off waivers on Sunday.
Cortes is out of the lineup for Sunday's game against the Red Sox.
Walton is out of the lineup for Sunday's game against the Red Sox.
Marte is out of the lineup for Sunday's game against the Nationals.
Williamson (shoulder) will make his next rehab start at Triple-A Louisville on Tuesday, MLB.com reports.
Suarez went 1-for-3 with a walk and a two-run home run during the Reds' 8-2 loss to the Nationals on Saturday.
Burns (13-2) took the loss against the Nationals on Saturday, allowing five runs on six hits and three walks while striking out six across 5.1 innings.
Harris gave up a run on three hits and a walk over 1.1 innings Saturday to record his 10th save of the season in a 7-3 win over the Red Sox. He struck out two.
Jump (5-7) picked up the win Saturday, allowing two runs on six hits and two walks over six innings in a 7-3 victory over the Red Sox. He struck out 11.
The Reds optioned Petty to Triple-A Louisville on Saturday.
