Castillo may only make one or two starts in September before being shut down for the season, Zach Buchanan of the Cincinnati Enquirer reports.
Though he's recorded a win in just two of his 13 starts, Castillo has been the Reds' top starter since making the leap from Double-A Pensacola to the majors in late June, submitting a 3.26 ERA, 1.14 WHIP and a 9.7 K/9 rate. However, since he's already accumulated 157.2 innings between both levels and the Reds have previously stated that they would like to keep the rookie around 165 innings for 2017, a shutdown seems imminent. While that will limit Castillo's utility for fantasy owners the rest of the way, manager Bryan Price indicated it won't have any bearing on the right-hander's status heading into 2018. Price has already stated that the 24-year-old is a lock to open next season as a member of the rotation.