The Mets are adding depth to their medical department. After a season in which the team was decimated by injuries, particularly to the starting rotation, general manager Sandy Alderson said Monday that two new people will be added to the medical staff — plus a trainer to replace recently fired Ray Ramirez. Alderson indicated the team will add a “high performance director” at the top of the medical department. “That will allow us to incorporate more technology related to exertion, recovery and a host of other things that we follow with biometrics,” Alderson said at the general managers’ meetings. In addition, Alderson said new manager Mickey Callaway and pitching coach Dave Eiland are involved in keeping tabs on the pitchers’ offseason throwing programs. Last season the Mets were without Noah Syndergaard, Matt Harvey, Steven Matz, Zack Wheeler and Seth Lugo for extended stretches, as only Jacob deGrom remained healthy throughout.