Patrick Reed has revealed he was in a "dark place" after being hospitalised with double pneumonia and warned it could prove fatal.
Reed, who missed the first two FedEx Cup play-off events, said he had been "battling for my life" in Houston Methodist Hospital in Texas after returning to action with a two-over-par 72 in the first round of the Tour Championship.
"I think I was in there for five or six days. I don't know exactly how long," the former Masters champion told reporters at East Lake.
"I don't remember the exact timeframe I was actually in the hospital, but it felt like an eternity.
"First couple days they were sitting there telling me that make sure you text your family quite a bit, talk to your family, because you just don't know. I mean, this is not good. We're not in a good spot right now.
"With how the hospitals are these days because of Covid and everything that's going on, it doesn't matter what's going on. They won't allow people in there, so it's only you in there.
"So I'm sitting there and those first two days the only thing that was going through my mind is I'm not going to be able to tell my kids goodbye. I'm not going to be able to tell them I love them. I'm not going to be able to tell my wife that I love her and give her a hug.
"It definitely puts you in a dark space when you're in there, especially those first two days. But I'm so happy to have such an amazing team and such amazing doctors that were working with me to get me through it and to get me working in the right direction on the way up.
"And to think that I'm able to be here and play, I really felt okay. I mean, it's a little frustrating not having the speed, not being able to hit the shots and really feel certain things quite yet, but I took a ton of time off.
"I mean, I was battling for my life. I was in the hospital. And the good thing is now I can hit the ground running hopefully."
Reed admitted he would not be playing in Atlanta if not for the need to impress Ryder Cup captain Steve Stricker and earn one of the six wild cards which Stricker will name on Sunday.
"The biggest thing is, talking with Stricks and stuff, is just making sure I'm healthy and I think the biggest thing for me this week is just to see kind of where I'm at," Reed added.
"And I know by Ryder Cup my game's going to be where it needs to be, as long as I feel like my health is where it needs to be and as long as I feel like I can sustain through rounds of golf."