However, before Sunday's game, Terry Collins would not say whether a final decision had been made whether to start Matz or veteran Bartolo Colon.
Meanwhile, Jon Niese will begin getting work in the bullpen in preparation for a role on the post-season roster, Collins confirmed.
According to Collins, Niese approached him with the idea last week.
In the event Matz starts over Colon, Collins did not say whether would shift to a role in the bullpen, where the 42-year-old veteran has seven career relief appearances, including one this season.
Niese has only one career bullpen appearance.