Newcomb will serve as the opening pitcher during Saturday's game against the Cardinals, James Fegan of the Chicago Sun-Times reports.
Rodriguez (back) is expected to join Triple-A Durham for a rehab assignment Sunday, Adam Berry of MLB.com reports.
Mesa went 1-for-2 with a solo home run, a walk and a stolen base in Friday's 3-1 win over the Astros.
Rasmussen did not factor into the decision in Friday's 3-1 win over the Astros, allowing one run on eight hits and no walks with four strikeouts over seven innings.
Caminero went 1-for-4 with a two-run home run in Friday's 3-1 win over the Astros.
Lux (shoulder) has resumed full baseball activity, Marc Topkin of the Tampa Bay Times reports.
Williamson (hamstring) has resumed baseball activities, Marc Topkin of the Tampa Bay Times reports.
Murakami is absent from the lineup for Friday's game in St. Louis.
Fedde (8-9) was tagged with the loss versus Pittsburgh on Thursday, allowing two runs on four hits and one walk while striking out one batter over 5.1 relief innings.
Smith tossed two scoreless innings in a no-decision against Pittsburgh on Thursday, allowing two hits and striking out three batters.
