Celtic had the better of the Hammers the last time the two teams met, but in Cup football everything can change in a heartbeat and unless a team wants to be sitting on the sidelines next weekend, they'll need to ensure they put their best foot forward to claim the result.
Both the Celtic and the Bhoys will be hoping for an all-Marist grudge match for the final next weekend, but the Hammers, who have been local league champions for several years, and St Anthony's, who won the first round of the local league this season, are always sides to be wary of and will be looking to spoil that dream and claim finals spots for themselves.
In the main game of the day, Wanganui Athletic have their work cut out for them as they head into the second leg of the Charity Cup against Wanganui City.
With City holding a 2-1 win in last week's fixture, they only need a win or a draw today to claim the Cup, but will be wary of Athletic's ability to step up in derby matches when it's needed.
Athletic know the formula is simple and have the added advantage of being the " way" team for his game, meaning that should they win today and send the tie to be measured on aggregate, any goals this afternoon will be counted as double.
City's victory last weekend set the aggregate score at 4-1 in their favour, so they know they need to keep Athletic at bay completely.
A 2-1 victory for Athletic would send the tie into extra time and penalties if required, while something like a 3-1 or 3-2 victory to Athletic would see the Reds lay claim to the Cup on aggregate.
With those formulas sitting in the back of their heads, both sides will surely be taking the field with plenty of determination not to let the other into the match.
It's sure to be a hot encounter, with plenty of attacking football spreading itself right across the wide pitch of Wembley's main ground.
So if you're looking for some free entertainment this Saturday afternoon, make your way over to Wembley Park from 12.30pm for the Bowl and Plate semi-finals, and take in the Charity Cup decider at 2.45pm on the main ground. There's sure to be fireworks.