The inspirational midfielder, who plays for Swedish club GIF Sundsvall in the Superettan (second division), will now battle for a first-team place alongside Jamal Mohamed, McDonald Mariga, Austin Makacha and Osborne Monday.
Mambo will be travelling with his team GIF Sundsvall to Malta for pre-season training ahead of the start of the Swedish league season that kicks off on April 12.
He will join the Harambee Stars squad together with the other overseas-based players on March 23, five days before the game against Tunisia in Nairobi.
Samm Audu, Goal.com