Topa underwent an MRI on Tuesday that revealed a 25 percent tear in his left patellar tendon, Do-Hyoung Park of MLB.com reports. He'll be immobilized for the next week before he beginning his ramp-up program.

Topa underwent an MRI on his left knee after feeling soreness following his last rehab appearance with Triple-A St. Paul on Sunday, Bobby Nightengale of the Minneapolis Star Tribune reports.

Topa (knee) will begin a rehab assignment with Triple-A St. Paul on Thursday, Dan Hayes of The Athletic reports.

Topa (knee) threw a 20-pitch live batting practice session Tuesday, Bobby Nightengale of the Minneapolis Star Tribune reports.

Topa (knee) will throw live batting practice Tuesday, Aaron Gleeman of The Athletic reports.

Topa played catch from 75 feet on Saturday and has been pain-free in his left knee, MLB.com reports.

Minnesota placed Topa on the 15-day injured list Thursday with left patellar tendinitis.

Topa will begin the season on the injured list after being diagnosed with knee tendinitis Sunday, Do-Hyoung Park of MLB.comreports.

The Mariners and Topa avoided arbitration by agreeing to a $1.25 million contract Thursday, Daniel Kramer of MLB.com reports.

Topa (5-4) got the win against the Mets on Saturday, firing 1.1 scoreless innings during which he allowed two hits and did not issue a walk or record a strikeout.