The PRO14 season was suspended earlier this month and is unlikely to resume until August at the earliest.
And Du Plessis has registered to return to the NHS as a respiratory physiotherapist.
"I strongly believe it's important to have all hands on deck to overcome this virus," he tweeted.
South Africa-born prop Du Plessis graduated in physiotherapy from the University of Salford in 2008 at a time when he was playing for Sedgley Park.
Du Plessis signed a new two-year contract to combine playing with being scrum coach at Scotstoun in June.