A's promote top prospect, LHP Gage Jump, with Aaron Civale hurt

Top prospect Gage Jump is set to join the Athletics' roster when starter Aaron Civale is placed on the injured list, according to multiple reports Tuesday.

A left-handed strikeout pitcher, Jump has fanned 56 batters in 38 innings over nine starts at Triple-A Las Vegas this season. The 23-year-old has walked 20 and posted a 4.50 ERA with an 0-2 record.

A second-round draft pick out of LSU in 2024, Jump is the No. 41 overall prospect in baseball per MLB Pipeline, which rated him third among A's prospects behind shortstop Leo De Vries and left-hander Jamie Arnold. Arnold was the 11th overall pick in the 2025 draft out of Florida State and is currently pitching at Double-A Midland.

Civale was pulled after four innings on Monday, raising red flags with a velocity drop that manager Mark Kotsay traced postgame to an issue with his right shoulder or lat. The A's said Civale would undergo testing Tuesday.

He allowed seven runs on nine hits and one walk, tossing only 73 pitches in Monday's 9-2 loss to the visiting Seattle Mariners. He allowed five runs in five innings to the Los Angeles Angels last week, when he said he had been "working through" the arm issue "for a little bit."

His fastball velocity averaged 88.3 mph on the stadium radar gun on Monday, more than 3 mph off of his 2026 season average.

Civale, 30, is 5-2 this season and his ERA stands at 4.20 through 11 starts. Prior to facing the Angels and Mariners in the past two turns through the rotation, he had a 2.70 ERA. He surrendered 14 hits (six home runs) and 12 earned runs in those two games.

--Field Level Media