Gregson, the Australian 1500-metre national champion, is presently in Madrid on his final training stint en route to London where he will start his campaign in the 1500m heats on August 10.

The national champion, who now runs for Victoria, is in great form after running several races in the ongoing Diamond League series in Europe.

"Since the Olympics in Rio, I have been in great form running personal bests in my event and the mile and looking forward to London where the competition will be tough," Gregson said from his training camp.

The Diamond League series started with the event in Doha where he achieved his qualifying time of 3min 34.56sec in finishing seventh in the 1500 metres.

Next was the now famous Bowerman mile in Eugene, where Gregson clocked an impressive 3:56.9, a season's best in finishing 11th behind Kenya's Richard Kwemoi.

Then came Diamond league meetings in Oslo, Stockholm and London before his final race in Rabat two weeks ago where Gregson clocked a personal best of 7:42.19 in the 3000 metres.

Gregson's partner Genevieve LaCaze will take part in the women's 3000 metre steeplechase and Thirroul's Madeleine Hills in the 5000 and 10,000 metre races.