Horan has kept some of his options open, admitting to a few niggles but nothing of any great concern.
Victory will keep the Steamers well and truly in the hunt for a Premiership top-two finish and a finals berth, while defeat will probably end the side's championship aspirations.
"We're really positive," Horan said.
"We have had a decent turnaround and the boys have had a couple of days away to freshen up their bodies and minds. It's been a big campaign. We're pretty disappointed after the last three losses. We're here to do a job and we're not doing it."
He said the Auckland match, to kick off at 2.35pm, would be a "big challenge".
"Their backs are up against the wall. It's going to be a very competitive contest. Everyone's aware of being near the bottom. It's the same with everyone across New Zealand - look at Waikato, they lose their next three games and they could be on the cusp.
"This is the quality of the competition and it's a testament to where we're at as a rugby nation."
He said despite the three consecutive losses, the Steamers remained in a buoyant mood, determined to lift their game and their standing from last season when they finished sixth.
"We were sixth last year and seventh the year before so we see ourselves as a top-seven union. We're still identified as one of the minnow unions but we achieve very well. We're very buoyant, we want to win this NPC.
"With three games to go and being in third would we be happy with that? We would be pretty content, but for us to achieve what we want we have to be a lot more precise and accurate and have the desire."
An extra incentive is provided by the John Drake boot being on the line for the third time. The former All Black played for Auckland, and lived in the Bay of Plenty after retiring from rugby.