Syndergaard (elbow) will begin a rehab assignment at High-A Brooklyn on Thursday, Anthony DiComo of MLB.com reports.
The Mets expected Syndergaard to begin a rehab assignment this week, and he now has a date scheduled for his first outing. While the right-hander will likely make some appearances in the higher levels of the minors before he rejoins the major-league club, he shouldn't need much time to build up his pitch count since he's slated to pitch out of the Mets' bullpen once he returns from the injured list.