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.
Simpson was optioned to Triple-A Rochester after Sunday's 5-3 loss to the Cardinals.
Perez didn't factor into the decision Sunday against Houston, striking out two while allowing one run on six hits and two walks in 4.1 innings.
Dodd struck out the side to notch the save Sunday against Houston.
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.
Riley is out of the lineup for Sunday's matchup with the Astros.
Dion earned his first career save after retiring the only batter he faced in Saturday's 8-5 extra-innings win over the Cardinals.
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.
Alvarez didn't factor into the decision Saturday against the Cardinals after allowing five hits and a walk while striking out eight over six scoreless innings.
Tolman was charged with a blown save after allowing one run on three hits while striking out one over one-third of an inning in Saturday's 8-5 extra-innings win over the Cardinals.
