While it’s unclear how much time will elapse before play resumes in the 2019-20 NBA season, if it does at all, there are concerns among the league’s general managers and athletic training staffers that games might begin again before players are physically ready. “If you tell us two weeks in advance, and all we have is a two-week training camp to [get] guys back to work that have been out of work eight weeks, that’s a mess,” one NBA general manager said.