The Mets are set on limiting Zack Wheeler to 180 innings this season. It is part of the reason why they now have a six-man starting rotation (limiting Matt Harvey’s workload is also motivation). But the expanded rotation will not safeguard Wheeler for the duration of the season. Wheeler has thrown 114 1/3 innings between Triple A and the majors and today Mets manager Terry Collins said Wheeler has fewer than 10 starts remaining this season based on the roughly 66 innings that remain on his artificial limit. As a result Collins also revealed that the he and pitching coach Dan Warthen have discussed moving Wheeler to the bullpen at the end of September. Wheeler last pitched out of the bullpen in 2010 – his first year in professional baseball – with the Giants’ Single-A affiliate. He made eight relief appearances. "We're just trying to figure out how we can save innings and get them through it" Collins said. Wheeler 23 carried a no-hitter into the seventh inning against the Marlins last night. He is 4-1 with a 3.55 earned-run average in eight starts with the Mets this season. John Buck’s wife is due to give birth to their third son tomorrow. Since his wife is in New York and the Mets will begin a homestand at Citi Field Friday Buck may not need a three-day paternity leave. But if he does the Mets will need to add a catcher. And according to Terry Collins top prospect Travis d’Arnaud is an option. D’Arnaud however has only played six rehab games in the Gulf Coast League since he fractured his foot while catching for Triple-A Las Vegas in April. He joined Double-A Binghamton today but Collins hinted that his limited action is a deterrent. But he’s also the only catcher on the Mets’ 40-man roster besides Buck and his backup Anthony Recker. The Mets' other options would be Francisco Peña son of Yankees bench coach Tony Peña and Juan Centeno. They're both with Triple-A Las Vegas.