Manager Carlos Mendoza said Monday that Blackburn (hand) was scratched from his start Monday against the Blue Jays due to a back issue, Tim Healey of Newsday reports.
Blackburn was placed on the 15-day injured list Aug. 25 after taking a comebacker off his pitching hand. He was slated to return from the IL to start Monday, but the Mets opted to delay activating him once the back issue cropped up. Mendoza added that the Mets will monitor Blackburn's back over the next couple of days, and the right-hander will not pitch in the upcoming series in Toronto, per Mike Puma of the New York Post.