Full House’s Dave Coulier spoke out against criticism of his costar John Stamos, who recently supported him by wearing a bald cap amid his stage 3 cancer battle.

Dave Coulier, an actor and comedian who found fame as Uncle Joey on “Full House,” has revealed he has been diagnosed with stage 3 non-Hodgkin lymphoma, a blood cancer. Coulier shared the news Wednesday during an interview on “Today.

"I kind of look like a little baby bird now, but it has been a roller coaster ride for sure,” Coulier said, adding that the diagnosis was like a "gut punch."

Dave Coulier, best known for his role as Joey Gladstone in "Full House," provided a health update on social media, as he shared he was receiving chemotherapy.

I thought to myself, ‘If I can be just 1/10th of a percent as strong as they were, then I’m going to be just fine,’ ” Coulier, 65 told PEOPLE