No specifics on his case were given Saturday in the announcement by the league and the NHL Players' Association.
McGrattan will continue to draw his salary and benefits and will face no penalty as long as he complies with his treatment and follow-up care. The program's doctors are Dave Lewis for the NHL and Brian Shaw for the NHLPA.
McGrattan, an enforcer, is in his third NHL season. He has appeared in just three games for the Coyotes, drawing 12 penalty minutes. He spent the past two seasons with Ottawa.