The designation is being used for players who are in quarantine and undergoing contact tracing. It doesn't necessarily mean an individual has tested positive for COVID-19.
Williamson's absence is related to an inconclusive test and the timing of the results of another test, a source told ESPN's Andrew Lopez. The Pelicans reportedly believe it is not a significant issue.
Williamson is averaging 21.9 points, 8.1 boards, and 1.3 steals through nine appearances this season. He currently ranks seventh in the Association in total offensive rebounds (33) and 13th in free-throw attempts (66).
The former No. 1 overall pick finished third in the NBA's 2019-20 Rookie of the Year voting and was a member of the NBA All-Rookie first team.