The left-hander suffered a torn patellar tendon in his right knee Monday after tripping on his son's toy, according to TR Sullivan of MLB.com.
Jones underwent surgery Wednesday. The injury is expected to sideline him for the entire 2020 season if and when it begins, Sullivan adds.
The 31-year-old Jones converted to a full-time pitcher in 2017 after failing to make it as an outfielder with the Seattle Mariners. Across two minor-league levels last year, he authored a 2.67 ERA in 64 innings.