Mets rookie pitcher Steven Matz (side) will not start Thursday against the Phillies, per Marc Carig of Newsday.
The hope was that one additional day between starts would allow Matz to take the hill against Philadelphia, but with the side soreness lingering into Wednesday, manager Terry Collins has opted to scratch the 24-year-old.
Matz could still slot in as a reliever this weekend, but if he's unable to turn the page on the issue by then, his spot on the National League Division Series roster could be compromised.