Ngongotaha have the best defensive and attacking records in the premiership - conceding only five goals whilst scoring 45.
Waikato Unicol AFC are 11 points behind the leaders with three wins, three loses and four draws to their name.
But they do go into the game on the back of a 1-0 hard-fought win over Katikati FC Ambria last Saturday.
"We won't take any game as a given win, even though we are flying right now. Our head is on the line so it's us that has everything to lose," said Haua.
"Waikato will raise their game I'm sure and we have to be prepared for that."
Elsewhere, sixth-placed Rotorua United will look to get their first win in five games as they take on ninth-placed Old Blues away.
Tomorrow's draw:
WaiBOP Premiership (kick-off 2.45pm)
Waikato Unicol AFC Prem v Ngongotaha AFC, Old Blues Prem v Rotorua United, Wharepai Domain 1; SGS Papamoa Premiership v Otumoetai FC First Credit Union, Gordon Spratt Park 6; Melville United Prem v Tauranga Boys' College 1st XI, Gower Park 5; Cambridge FC Prem v Matamata Swifts Prem, John Kerkhof Park 1; Tauranga City Premiership v Katikati FC Ambria Premiership, Links Ave 1.
WaiBOP Championship (kick-off 12.30)
Waikato Unicol AFC Reserves v Ngongotaha Champ, Waikato Uni 2; Cambridge FC Champ v Matamata Swifts Reserve, John Kerkhof Park 2; Old Blues Champ v Hamilton Wanderers Champ, Wharepai Domain 1; Taupo AFC Champ v Tokoroa AFC Champ, Crown Park 1; Whakatane Town Champ v Te Awamutu Edmond Judd Champ, Rex Morpeth Park 1; West Hamilton Champ v Otumoetai FC Mens, Weka St 1.