The Cardinals will recall Mathews from Triple-A Memphis to start the first game of Monday's doubleheader with the Reds in Cincinnati, Derrick Goold of the St. Louis Post-Dispatch reports.
Iglesias earned the save in Sunday's 5-3 win over Arizona, despite allowing a run on a hit and a walk in the ninth inning.
Elder allowed a run on four hits and a walk across six innings in a no-decision Sunday against the Diamondbacks. He struck out five.
Mathews will be called up from Triple-A Memphis and start Game 1 of Monday's doubleheader against the Reds, Derrick Goold of the St. Louis Post-Dispatch reports.
Walker went 3-for-4 with a two-run home run, two doubles and four total RBI in Sunday's 11-4 win over the Cubs.
Dobbins (3-3) allowed two runs on two hits and four walks while striking out seven over five-plus innings to earn the win over the Cubs on Sunday.
Burleson went 3-for-5 with a two-run home run, a double and four total RBI in Sunday's 11-4 win over the Cubs.
Atlanta will grant Santana's release from Triple-A Gwinnett and he will become a free agent Sunday, per Jeff Passan of ESPN.com.
Fermin is out of the lineup for Sunday's matchup with the Cubs.
Dubon is out of the lineup for Sunday's game against the Diamondbacks.
