Juma, 21, has played the entire 90 minutes of the first two league matches this season.
Cliff Nyakeya, Andrew Juma and Chrispin Oduor were on target in the 3-0 win.
The pair of David Okello and James Kinyajui replace the suspended Job Ochieng' and Daniel Mwaura.
There are three changes from the squad that beat Chemelil Sugar 2-0 last weekend.
Kimani provided an assist for Alwanga’s second goal and was a constant menace for the Millers.
Cliff Nyakeya and Clifford Alwanga were on target in the 2-0 win over the Millers.
Nyakeya now wants to add silverware to his list of achievements at Mathare.
The Slum Boys host Chemelil Sugar at Kasarani on December 8 for their season opener.
"I am happy with what we have done this year. There is some huge development," said Kimanzi.