Phillies right-hander Jesen Therrien underwent Tommy John surgery earlier this week and could miss the entire 2018 campaign as a result, as Jeremy Filosa of 98.5 FM Sports in Montreal (Therrien’s hometown) first reported, on Twitter.
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The 24-year-old Therrien made his Major League debut this season, appearing in in 15 games and totaling 18 1/3 innings. As Matt Gelb of the Philadelphia Inquirer notes, his 92.6 mph average fastball in the bigs was diminished from his minor league velocity, and Therrien’s results were nowhere near the promising output he showed in the minors. Therrien obliterated minor league opponents, posting a ridiculous 1.41 ERA with 10.2 K/9 against 1.4 BB/9 in 57 1/3 innings between Double-A and Triple-A. In the Majors, he logged an 8.35 ERA on 24 hits and seven walks with just 10 strikeouts.
The loss of Therrien for the 2018 campaign will deprive the Phils of one of their more promising relief prospects next season, though Therrien is certainly young enough to bounce back and make meaningful contributions when the Phils are closer to contention in 2019 and beyond.
In the meantime, the Phillies will turn to a bullpen group that is likely to feature Hector Neris, Luis Garcia, Edubray Ramos, Kevin Siegrist and Adam Morgan next year. Other candidates will include young arms such as Victor Arano, Hoby Milner, Ricardo Pinto, Yacksel Rios and Zac Curtis, though the Philadelphia front office could certainly look to augment its internal options with some veterans on the free-agent and/or trade markets this winter. President Andy MacPhail, GM Matt Klentak and the rest of the Phils’ front office brought in veterans Pat Neshek and Joaquin Benoit last winter, both to help stabilize a group of inexperienced relievers and for the potential to emerge as summer trade chips.