Triple-A Memphis placed Henderson on the 60-day injured list Wednesday due to a left elbow strain, Jeff Jones of the Belleville News-Democrat reports.
The left-hander was reinstated from the 60-day IL on Aug. 9 after missing the first three months of the season due to a flexor strain, but he's down with another arm injury after making just one start for Memphis. Henderson posted a 2.59 ERA, 1.14 WHIP and 134:51 K:BB across 132 innings at Double-A Springfield last year, but he's had a lost 2026 season. The severity of his current injury is unclear as he continues to be evaluated.