Norway's Jakob Ingebrigtsen will make his half-marathon debut in Copenhagen on Sunday, less than two days after racing to 1,500-metres victory in the Diamond League final in Brussels on Friday evening.The 21-kilometre race will cap a brilliant season for the 23-year-old who won Olympic gold in the 5,000m in Paris.Copenhagen Half Marathon organizers announced the news on their website on Saturday."I'm looking forward to test myself in the half marathon, for the first time, in Copenhagen," Ingebrigtsen said on the website. "Normally this is a distance that would suit my training very well, but after a long season on the track working towards the 1500m, it's exciting to see if I even can reach the finish line."Ingebrigtsen had hinted the news in a cryptic Instagram post after racing to his third consecutive Diamond League final victory in the 1,500m, writing "What a great way to end the season… or?"The Norwegian is a double Olympic champion, having won gold in the 1,500m at the 2020 Tokyo Games.Ingebrigtsen will test himself against a field that includes world record-holder Jacob Kiplimo and world champion Sabastian Sawe.