They will be tired and sore while the Steamers have had a nine-day break since beating Northland last week.
It is crucial, therefore, that the home team are ahead or close going into the final 15 minutes so they can take full advantage of any Lions fatigue.
Expect nothing less, then, than a full-on physical confrontation from the Steamers, who will want to ensure the likes of superstar loose forward Ardie Savea spends most of the game face-to-face with Baypark's well-manicured turf.
McMillan coached many of the Wellington team at club level and in the winning national under-19 side last year.
"We need to take a positive mindset into this game against a quality Wellington side," he said.
"When we play with confidence and without fear we have the ability to score tries just like any other team.
"If we achieve that we will place pressure on a team that will have high expectations of a win on our home ground."
-The high performing Bay of Plenty Development team will meet unbeaten Waikato Development in the curtain-raiser from 2pm, before Bay of Plenty Baywide rippa rugby champions Te Akau Ki Papamoa take on Tauranga Primary School at 4pm.