The 24-year-old Real Sociedad player, who missed the last two matches through suspension and injury, is among the seven professionals called up by Kenya coach Zedekiah Otieno for the decisive match at the Nelson Mandela Namboole stadium on Saturday.
"Derbies are never easy. It is going to a hard match for both teams. It will be a fierce contest," said Mariga.
The build-up to the match has intensified in the two countries, as both of the great regional arch-rivals have still got a chance to qualify for the finals in Equatorial Guinea and Gabon in January and February.
The game, however, has huge implications for the hosts, who currently sit on top of Group J with ten points, and need a win to make sure they reach the finals for the first time in 33 years.
The Kenyans, placed third with seven points, can also still make the finals if they can snatch a rare away victory, while hoping that second-placed Angola do not beat Guinea-Bissau in the other group match.