Gabriel, 24, is 6-foot-9 and has been playing for the Wisconsin Herd of the G League. He went undrafted out of Kentucky in 2018, but has spent time in the NBA, most recently with the Pelicans — averaging 3.4 points and 2.6 rebounds in 21 appearances last season.
He has also played for the Trail Blazers and Kings.
The NBA reportedly has a vaccination rate of 97 percent, but like the NFL and NHL, is experiencing a major outbreak of positive tests and players entering protocol. The Associated Press reported Thursday evening that about 8 percent of NBA players were in protocol.