The club doctor John Imboiywoa confirmed that Shambi is suffering from a thigh strain while Waweru picked up picked up an undisclosed knock.
“Waweru is back in training but still has a week out at the least. Shambi is also out with a thigh sprain and we will need a week to observe him. It is not so bad but we need to take the necessary precaution,” Imboiywa told the club's website.
Head coach Benjamin Nyangweso has remained confident despite the unavailability of the two midfielders, saying that he hopes to see other players rise to the challenge.
“Their absence will definitely affect my plans because these are key players and crucial ones as well," Nyangweso told the club's press office.
"It means we have to do with some changes but I don’t think our midfield rhythm will be affected because we still have quality players to fit in there."
Ulinzi Stars lost 2-0 to Vihiga United earlier in the season, but have not lost in the last four matches.