NAIROBI, Jan. 3 (Xinhua) -- Chicago marathon champion Brigit Kosgei has ruled out competing at the IAAF World Cross Country Championships in Denmark in March.

The 24-year-old said she is fully focused on the marathon competition and will skip the championships to allow other young athletes to expose their talents.

"I will not be running at the Kenya trials for the World Cross Country Championships," Kosgei said on Thursday in Nairobi.

"I however will compete in a few road races to boost my preparations for the marathon season that starts in March," she added.

Kosgei, who is back in Kenya after competing at the San Silvestre Vallecana, an IAAF Silver Label road race, in Madrid, Spain, said she targets one big city marathon before thinking of the World Marathon Championships in Doha, Qatar.

"I have to plan for the World Marathon Championships if I will be selected. But at the moment, I have not confirmed which race I will be competing in April," she added.

On Monday, in Madrid, Kosgei stormed to a 29:54 performance, a course record in the 10km race, beating Ethiopia's Tirunesh Dibaba and Kenya's Hellen Obiri.

"I'm delighted with my performance but despite this fast time I will keep focused on the marathon," said Kosgei.

"I don't know where my next appearance will be as my management works on that, but I don't plan to compete at the Kenyan trials for the World Cross Country Championships," she added.