Valencia, who went 3-for-4 in Sunday's 8-1 loss to the White Sox, is batting .406 through nine games this month.
Melton exited Sunday's 8-1 loss to the White Sox in the fourth inning with right arm discomfort, Jason Beck of MLB.com reports.
Melton (undisclosed) exited his start Sunday against the White Sox in the fourth inning, Jason Beck of MLB.com reports.
Simpson was optioned to Triple-A Rochester after Sunday's 5-3 loss to the Cardinals.
Herz (elbow) is expected to be activated from the 60-day injured list and start Monday's contest against the Tigers, Kyle Williams of TheBanner.com reports.
Irvin took a no-decision Sunday against the Cardinals, striking out eight while allowing two runs on three hits and no walks in 5.1 innings.
Montero is scheduled to pitch Monday against the Nationals, piggybacking off starter River Ryan, Jason Beck of MLB.com reports.
The Tigers will call up Ryan from Triple-A Toledo to start Monday's game against the Nationals, Jason Beck of MLB.com reports.
Dingler is absent from the lineup for Sunday's affair with the White Sox.
Cornelio (3-2) earned the win in extra innings against the Cardinals on Saturday after allowing two unearned runs on three hits and a walk while striking out two over 1.2 innings.
