Andersen told reporters during a conference call Tuesday that he's "not 100 percent confident" in the league's ability to return to action, according to The Athletic's Joshua Kloke.
"We don't have enough information yet," Andersen added. "The league and (players' association) are still ironing things out. The 11th hour is coming up here."
Though he's not convinced it will happen, Andersen was adamant about his desire to return.
"I want to play," he said, according to The Athletic's Jonas Siegel. "I don't want to just sit and waste the summer and the season."
Andersen had been isolating in Arizona with Auston Matthews, who reportedly tested positive for COVID-19. He added that he left the state before its virus spike to train in California and is now quarantining in Toronto, according to the Canadian Press' Joshua Clipperton.
The 30-year-old is coming off his worst regular season with the Maple Leafs. He went 29-13-7 with a .909 save percentage, a 2.85 goals-against average, and three shutouts.