Irving did not play in the Nets' 122-109 victory over the visiting Philadelphia 76ers on Thursday night because of personal reasons.
Irving has been in contact with several members of the Nets' organization, including Nash, who said he wants to keep details of their conversation private.
Caris LeVert, who had 22 points and 10 assists in Thursday's win, said after the game Irving is dealing with a personal issue and that he texted teammates before the game.
Forward Kevin Durant, who is in quarantine after being exposed to someone who tested positive for COVID-19, was also out against the Sixers and the Grizzlies on Friday night. Nash said Thursday that if Durant continues to test negative, he could be available to play in Sunday's game against the Oklahoma City Thunder.
The Nets are also still without guard Tyler Johnson, who has been placed in the NBA's health and safety protocols. Nash said Johnson has not tested positive for the coronavirus but is not playing while he goes through contact tracing. It is unrelated, Nash said, to Durant being out.