In the wake of Tua Tagovailoa‘s recent string of head injuries … Warren Moon is revealing he, too, struggled with concussions during his NFL career — but, he tells TMZ Sports he’s not feeling any real effects from them decades later.

The 67-year-old Hall of Famer played for multiple franchises from 1984 to 2000 — and he says during that timeframe, he was diagnosed with a concussion on six separate occasions.

Moon, though, told us he still considers himself very healthy … and is consistently passing all of his medical checkups despite the repeated blows to the head he suffered when he was a star signal-caller.

“I don’t feel like I’ve lost any memory or anything like that.”

But, admittedly, he said he does wake up daily wondering if and when he will feel the effects of the many brain bruises he sustained.

With all that said, Moon tells us he knows Tua — who was just diagnosed with his third concussion last week — will have to face a big choice of whether or not he will continue playing … but he’s at least happy the 26-year-old will have time on injured reserve to weigh his options.

“So far, I feel really good,” Moon said of his health. “I’m taking good care of myself. I’m hoping the same thing for Tua as he moves on with his life.”