Johnson underwent arthroscopic left knee surgery Monday, Martin Gallegos of MLB.com reports.
Analysis:It's unclear how long the knee had been bothering Johnson, but he's expected to be ready to roll by the time spring training comes around. The right-handed reliever made 28 appearances between the Phillies and Athletics in 2026, finishing with a 5.88 ERA and 40:20 K:BB across 33.2 frames.
