Middleton (forearm) will begin a rehab assignment with Double-A Springfield on Tuesday, Daniel Guerrero of the St. Louis Post-Dispatch reports.

Middleton (forearm) through off the mound again Friday and is set for a rehab assignment next week, John Denton of MLB.com reports.

Middleton (forearm) threw a bullpen session Saturday and is expected to throw two more next week before heading to Double-A Springfield for a rehab assignment, John Denton of MLB.com reports.

Middleton (forearm) will throw a bullpen session Saturday, Jeff Jones of the Belleville News-Democrat reports.

Middleton (forearm) could throw a bullpen session later this week, Derrick Goold of the St. Louis Post-Dispatch reports.

Middleton (forearm) played catch from 110 feet Saturday and Sunday, Jeff Jones of the Belleville News-Democrat reports.

Middleton (forearm) started playing catch Sunday, Katie Woo of The Athletic reports.

Middleton received a platelet-rich plasma injection in his right forearm Saturday, John Denton of MLB.com reports.

Manager Oliver Marmol said Saturday that Middleton (forearm) has yet to resume his throwing program, John Denton of MLB.com reports.

Middleton (forearm) will start a throwing program Wednesday, Katie Woo of The Athletic reports.