However, Mandonga was non-committal on the exact round that he intends to floor Wanyonyi.
He only said he will finish off his calm opponent with his now famous 'Sugunyo' signature jab, a style he claims he perfected in Ukraine.
"I'm going to explode bombs in his head," stated the Tanzanian boxer who is unbeaten in four fights including one draw and two knockouts.
Mandonga arrived in Nairobi on Wednesday night.
He had a packed schedule on Thursday. He had lunch at the popular eatery, Mpambe Dishes, in California Estate, Nairobi.
He visited his opponent Wanyonyi at Gikomba Market under tight security, given his temperamental nature he could have decided to go bare-knuckle against Wanyonyi who sells clothes at the market as a side hustle.
He also visited the Standard Media Group PLC premises along Mombasa Road where he took part in a mock weighing-in and featured in the leading evening sports show, Zilizala.
The Saturday fight card, sanctioned by Kenya Professional Boxing Commission and staged by Solid Rock Promotions will feature two Tanzanians, one Democratic Republic of Congo and five Mauritius pugilists who will be up against Kenyan rivals.
Saturday matchups at the KICC
Adel Motean vs Lucien Botumbe
Tyrone Oliver vs Patrick Amote
Jean John Colin vs Raphael Odiallo
Kennedy St Pierre vs Yannick Mandu
Cedric Oliver vs Gerald Male
Reddy Bellehumeur vs David Omollo
Jane Kavulani vs Praxides Anyango
Morris Okolla vs Hudson Muhumuza
Rayton Okwiri vs Shanani Ally Andaro
Karim 'Mtu Kazi' Mandonga vs Daniel Wanyonyi