NBA COVID-19 protocol requires a seven-day quarantine for anyone who has exposure to someone with COVID-19.
Porter, 22, has averaged 19.5 points and 6.8 rebounds per game through four games this season. The No. 15 overall pick in the 2018 NBA Draft averaged 9.3 points and 4.7 rebounds per game in 55 appearances in 2019-20.
The Nuggets host the Suns at 9 p.m. EST Friday in Denver.