Dillon Gee and Jon Niese have long seen their names floated in trade rumors, but that trend could increase in the weeks to come, as ESPN New York’s Adam Rubin hears from a team source that the Mets may promote left-hander Steven Matz before month’s end. (Over the weekend, Mike Puma of the New York Post wrote that Matz could be up prior to the All-Star break, adding that GM Sandy Alderson said the lefty had little else to prove to the team in the minors.