According to league sources, Capitals’ assistant general manager for player personnel Brian MacLellan owns and uses an ARP­wave machine. Boston goaltender Tim Thomas is one player who has publicly acknowledged his use of the system and thanked its developers when he accepted the Vezina Trophy in 2011.

There remains no timetable for Green’s return, but when he does the defenseman will have two new coaches and must adapt to a new system of play. Green has attended team meetings and video sessions under Coach Dale Hunter and worked with assistant coach Jim Johnson, but it remains to be seen how he will fit into a style of play that doesn’t encourage as much offensive risk-taking as former coach Bruce Boudreau’s approach.

Of the 82 goals and 250 points Green accumulated in his career, he recorded 76 and 229, respectively, with Boudreau behind the bench.

“He’s been involved in all our meetings, he knows exactly the way we’re playing and he understands what we want to do,” Johnson said. “When he gets closer we’ll spend a little more time with him on the ice, get him more involved in the practices. . . . We all want Mike back in the lineup, but only when he’s 100 percent. It doesn’t help us to rush him only to have something else go wrong.”