Patrick Reed was "battling for his life" in a hospital in Houston, Texas when he came down with a serious case of double pneumonia last month.
Reed had withdrawn from the Wyndham Championship and the Northern Trust due to an ankle injury, but he then had to withdraw from the BMW Championship after being admitted to the hospital.
Speaking to the media after the first round of the Tour Championship on Thursday, the 2018 Masters champion said that he did not know how long he was in the hospital for and he experienced many dark thoughts while he was ill.
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"I don't remember the exact timeframe I was actually in the hospital, but it felt like an eternity," said Reed.
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"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, 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, 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."
It was great to see the 31-year-old back to full fitness at East Lake Golf Club on Thursday. Unfortunately, he shot 2-over-par to sit in a tie for 28th place.
Although it looks unlikely that he will win the FedEx Cup now, Reed is looking to impress US Ryder Cup captain Steve Stricker who must now decide on his six captain's picks of the event at the end of the month.
"The biggest thing is just making sure I'm healthy and just to see kind of where I'm at," Reed added.
"And I know by the 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."