Phoenix Suns coach Monty Williams has entered the league's health and safety protocols and will miss Monday night's game against the Memphis Grizzlies, sources told ESPN's Adrian Wojnarowski.

Suns assistant Kevin Young is likely the choice to become acting coach in Williams' absence, sources tell ESPN.

Williams is one of four NBA head coaches in protocols, including the Los Angeles Lakers' Frank Vogel and Chicago Bulls' Billy Donovan, with sources telling ESPN that Portland Trail Blazers coach Chauncey Billups entered protocols on Monday.

Sacramento Kings coach Alvin Gentry and the Indiana Pacers' Rick Carlisle are back coaching after spending time in COVID protocols.

Suns players Jae Crowder and Elfrid Payton entered the protocols, sources told Wojnarowski on Sunday.