The Mets are expected to initially carry Matt Reynolds then swap him for Triple-A reliever Jim Henderson when they return home next Friday, according to ESPN NY's Adam Rubin.
In this scenario, they'll start the season with a six-person bench and just five relief pitchers because Hansel Robles will be forced to serve a two-game suspension. Of course, because the team has three off days before playing their third game of the season, they can space out their bullpen and use Bartolo Colon and Steven Matz in relief, so five relievers will be fine.