Gray will undergo surgery Wednesday to repair a partial tear of the UCL in his right elbow, Andrew Golden of The Washington Post reports.

Gray (elbow) was transferred to the 60-day injured list Friday, Andrew Golden of The Washington Post reports.

Nationals manager Dave Martinez said Tuesday that the club will wait to send Gray (elbow) for an MRI until around the All-Star break, Spencer Nusbaum of The Washington Post reports.

Gray experienced elbow discomfort and felt more fatigued than normal during Sunday's rehab start at Triple-A Rochester, Andrew Golden of The Washington Post reports. Gray will undergo testing in the coming days.

Manager Dave Martinez said Wednesday that Gray (elbow) will make one or two more rehab starts with Triple-A Rochester, Bobby Blanco of MASNSports.com reports.

Gray (elbow) struck out four and allowed one run on four hits and zero walks over six innings in his rehab start Tuesday with Triple-A Rochester.

Gray (elbow) will make his next rehab start for Triple-A Rochester on Tuesday, Bobby Blanco of MASNSports.com reports.

Gray (elbow) will make another rehab start for Triple-A Rochester next week, Bobby Blanco of MASNSports.com reports.

Gray (elbow) struck out five over five innings while allowing two earned runs on three hits and three walks in his rehab start Wednesday with Double-A Harrisburg.

Gray (elbow) is expected to throw 75-to-80 pitches in his rehab start with Double-A Harrisburg on Wednesday, Mark Zuckerman of MASNSports.com reports.