The Red Sox optioned Criswell to Triple-A Worcester on Saturday, Jen McCaffrey of The Athletic reports.

Criswell did not factor into the decision Sunday, tossing a perfect four innings while striking out five against the Tigers.

Criswell came away with a no-decision in Tuesday's 6-3 win over the Blue Jays, allowing one run on five hits and three walks over 3.1 innings. He failed to strike out a batter.

Criswell didn't factor into the decision Wednesday against the Astros, allowing one run on four hits and a walk over 4.2 innings. He struck out four.

Criswell is scheduled to start Wednesday's game against the Astros in Houston.

Criswell (5-4) picked up the win Friday's 12-10 against the Orioles, allowing six runs on nine hits and four walks over 3.1 innings. He struck out one.

The Red Sox activated Criswell from the COVID-19 injured list Friday, Gabrielle Starr of the Boston Herald reports.

Red Sox manager Alex Cora said Thursday that Criswell (illness) is expected to be ready to start Friday in Baltimore, Chris Cotillo of MassLive.com reports.

Criswell might not be ready to return when his minimum seven-day stay on the COVID-19 injured list is up Friday, Gabrielle Starr of the Boston Herald reports.

The Red Sox placed Criswell on the COVID-19 injured list Friday, Alex Speier of The Boston Globe reports.