Update (5:15 p.m. ET): The Boston Globe’s Alex Speier reported that Perales has right elbow inflammation. An MRI has not been conducted at this point, but the Red Sox view the news with “cautious optimism,” per Speier.

It seems the Red Sox organization has been dealt another injury blow.

Luis Perales, the top pitching prospect in Sox Prospects’ rankings, exited a Double-A Portland game on Saturday due to injury, according to multiple reports. Perales left the game in the second inning after he missed on a 3-2 pitch.

It was not clear what caused Perales to exit the game, or the severity of the injury. However, multiple reporters in attendance noted that Perales, a 21-year-old right-hander, showed clear discomfort.

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Perales is ranked the No. 4 prospect in Boston’s farm system, according to Sox Prospects. He made his Double-A debut one week prior, and dominated during five innings of work.

Featured image via Annmarie Sinicki/Salem Red Sox