The Blue Jays optioned White to Triple-A Buffalo on Wednesday.
Reliever Zach Pop was called up from Triple-A to take White's spot on the 28-man active roster, but it's unclear whom the Blue Jays may turn to to replace White as their No. 5 starter. White's demotion comes after he was lit up for 18 earned runs on 19 hits and seven walks in 12 innings over his last three starts.