(CNN)Usain Bolt's glittering career may have ended on a disappointing note as he pulled up with a hamstring injury in the last 50 meters of the 4x100m at the 2017 world championships, but that may not have been the Jamaican sprint star's final act on the track.
Bolt won the last of his eight gold medals at Rio 2016 -- a relay gold from 2008 was subsequently stripped from the Jamaican team after Nestor Carter tested positive for a banned substance -- and has often ruled out a return for the 2020 Olympics in Tokyo.
But there have been times when he's mulled coming out of retirement.
"I talked to my track coach," Bolt told CNN Sport's Coy Wire. "And he was like, 'No, you're not doing it. People that retire and come back -- it doesn't always work out.'
Usain Bolt celebrates winning gold in the 4x100m relay at the Rio Olympics.
"For me, at the end I knew it was time because the drive wasn't there. But every time I watch track and field I miss it. And every time I go to the track to see my coach and I watch him training I go, 'Did I make the right decision?' ... But every time I train with them I think, 'Ah yeah I made the right decision. I don't miss this.'"
'Sit and watch'
Instead, Bolt will settle for a spot on the sidelines at the upcoming Games, the first for 20 years where he won't be competing.
In particular, he's looking forward to watching the action in the pool.
"I'm going to go and watch, I'm excited for the first time to sit and watch it and see the energy of people," Bolt said.
Bolt: 'A moment for me to prove people wrong' 02:13
"I've seen track and field throughout my life, I've always watched track and field and I always know what's going on with track and field. But I didn't see Michael Phelps swim live.
"For me, it's an opportunity to go and see these other swimmers and see something else.
"The only thing I got to see once was when I went to the Commonwealth Games and I went to watch netball. But I've always wanted to go and watch swimming live ... track and field, I love it, but this is what I really want to watch."
Since retiring, Bolt has had a stint as a footballer with Australia's Central Coast Mariners, scoring for the first team but not securing a long-term contract.
Usain Bolt goes to Borussia Dortmund training 01:13
He won an unprecedented three golds at consecutive Olympics between 2008 and 2016 in the 100 and 200 meters, and ran his world record times of 9.58 and 19.19 in Berlin in 2009.
"I live for competition," he said. "When I used to compete, I felt that if no one's running fast I'm not going to be happy.
"I wanted to go out there with the best, I wanted to line up with the best because I enjoy proving that I'm the best and to know that I've worked hard and it's paying off."
