Ndiku returned to the Kenyan cross country circuit at the end of the year, and finished fourth at another Athletics Kenya series race in Nairobi.
He began his career in domestic cross country running competitions and at the Athletics Kenya series meeting in Meru, he took fifth place in the junior men"s race at the age of sixteen. Ndiku earned himself a place on the Kenyan junior men"s team for the 2010 IAAF World Cross Country Championships with a third-place finish in the junior race at the Kenya National Cross Country Championships. In the world junior men"s race in Bydgoszcz the following month, he formed part of the leading pack before quickening the pace to establish a significant lead.
In 2011 he started his technical collaboration with the Italian coach Renato Canova, who planned for him a strategy looking at 5000m.