San Antonio Spurs' coach Gregg Popovich argues a call without a mask fully covering his face during a game against the Los Angeles Clippers at Staples Center in Los Angeles on Tuesday, January 5, 2020. The NBA and players union on Tuesday revised their COVID-19 protocol. Players now are prohibited from having non-team guests in their hotel rooms and will be required to wear masks while on the bench. File Photo by Jim Ruymen/UPI