MONACO (REUTERS) - Jamaican sprint great Usain Bolt says he has no regrets about his decision to retire from athletics in 2017 as he has accomplished everything he wants to in the sport.

Bolt will hang up his spikes following the World Championships in August, bringing the curtain down on a career that has delivered eight Olympic gold medals.

"I've just done everything I wanted to do in the sport," Bolt told Reuters on the red carpet at the Laureus World Sports Awards in Monaco.

"I asked (former U.S. sprinter) Michael Johnson the same question, 'why did you retire when you were on top?'. He said the same - he had done everything he had wanted to do in athletics so there was no reason to stay in the sport. Now I understand what he means."

Bolt completed a 'treble-treble' of 100m, 200m and 4x100m Olympic titles at the 2016 Rio Games, but had his 2008 relay gold stripped last month after team-mate Nesta Carter's re-tested sample showed traces of a banned substance.

Carter has filed an appeal to the Court of Arbitration for Sport (CAS). Carter is awaiting a date to come before the CAS for his appeal, lawyer Stuart Stimpson told Reuters after confirming the appeal had been submitted within the 21-day deadline.

"Yes, they were sent electronically today and the hard copies (sent by courier) will get there tomorrow, so they (documents) have been filed," Stimpson said.

"We've paid our fees and we met our time line."

Carter retroactively tested positive for the banned stimulant methylhexaneamine in 2008 and on Jan 25, was stripped of his 4x100m gold medal along with Beijing Games team-mates Usain Bolt, Asafa Powell, and Michael Frater.

The filing of the appeal came four days after the 2013 World Championship 100m bronze medallist made his competitive return by anchoring his MVP track Club's 4x100m team to second place at the Milo Western Relays in Montego, ending 17 months of inactivity.

That came after clearance was given to him by the IAAF, the world track and field governing body.