Boston Red Sox right-hander Steven Wright underwent left knee surgery Monday, the team announced.
Wright had an arthroscopy and debridement at the Hospital for Special Surgery in New York. He is expected to return to pitching in the 2019 season, though a specific timeframe was not announced.
Wright, a knuckleballer, underwent an invasive surgery that included a cartilage restoration procedure on the same knee in May 2017. He began the 2018 season on the disabled list and returned for two other stints on the DL later in the year with left knee inflammation, including one during the first round of the postseason that left him sidelined for the remainder of the Red Sox's World Series run.
The 34-year-old was 3-1 with a 2.68 ERA in 20 games (four starts) for Boston last season. He was an All-Star in 2016, going 13-6 with a 3.33 ERA in 24 starts.