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.
The Cardinals designated Velazquez for assignment Saturday.
The Reds optioned Petty to Triple-A Louisville on Saturday.
Cardinals president of baseball operations Chaim Bloom said Friday that Roby (elbow) could be ready to face hitters in the coming days, Daniel Guerrero of the St. Louis Post-Dispatch reports.
Mey gave up two hits and struck out four over 2.2 scoreless relief innings in Friday's 5-3 loss to the Nationals. He didn't walk a batter.
Rodriguez started in center field and went 1-for-4 with a double in Friday's 5-3 loss to Washington.
De La Cruz went 1-for-2 wth two walks and a solo home run in Friday's 5-3 loss to the Nationals.
The Cardinals are expected to designate Velazquez for assignment Saturday, Jeff Jones of the Belleville News-Democrat reports.
Herrera went 1-for-4 with a solo home run, a run scored, and two strikeouts in Friday's 3-2 win over the Rockies.
