Castellani underwent surgery to remove particulates around his right elbow and is on the minor-league injured list, Nick Groke of The Athletic reports.
Castellani last pitched for Triple-A Albuquerque on June 13, but it's unclear how long he was dealing with the issue. The 23-year-old has no official timeline for his return.
Castellani was optioned to Triple-A Albuquerque on Monday.
Castellani opened spring in big-league camp due to his status as a member of the 40-man roster but was never likely to remain there long. He'll get a promotion this season despite recording a fairly poor 5.49 ERA in 26 starts for Double-A Hartford last season.
Castellani had his contract selected from Double-A Hartford on Tuesday.
This move protects Castellani from the Rule 5 draft. He spent the 2018 season repeating Double-A, struggling to a 5.49 ERA, 1.53 WHIP and 6.1 K/9 across 26 starts (134.1 innings). Still, he's just 22 years old and will have time to prove himself as he presumably makes the jump to Triple-A in 2019.
Castellani was reassigned to minor-league camp Wednesday.
Castellani stood little chance of cracking the Opening Day roster due to the number of arms clamoring for innings at the major-league level, and his eight runs allowed in three innings pitched this spring certainly didn't help. The pitching prospect completed his first full season at Double-A Hartford last season, producing a 4.81 ERA and a 7.6 K/9 in 27 starts for the Yard Goats. Castellani should see plenty of time at Triple-A this season as he develops more against upper-level hitters.
Castellani, 21, has a 5.02 ERA and 97:34 K:BB in 114.2 innings for Double-A Hartford.
Castellani has been slightly more hittable than he was a season ago, and he is allowing fewer groundballs than ever before. In addition, he has surrendered a career-worst 11 home runs in 2017. The 21-year-old has the size and arsenal to develop into a big-league hurler, but he remains a work in progress at this point in time.
|More Pitching Stats|
|Minor League Pitching Stats|
|2014||ASX-Tri-City Dust Devils||1||2||3.65||10||10||0||0||0||37.0||35||20||15||2||4||9||25|
|2017||AA-Hartford Yard Goats||9||12||4.81||27||27||1||1||0||157.1||163||94||84||16||12||47||132|