Johnson signed a 10-day contract via hardship exemption with the Celtics on Wednesday, Adrian Wojnarowski of ESPN reports.
Johnson, who was drafted by the Celtics 20 years ago, hasn't played in the NBA since 2017. The seven-time All-Star has most recently been dominating the BIG3, but due to the COVID-19 outbreak in the NBA, he will get another stint in the NBA. Wojnarowski reports that the 40-year-old is expected to be available for Boston when it faces Cleveland on Wednesday night.