Wellington Phoenix's historic FFA Cup semi-final against Melbourne Victory will be held in Geelong on Saturday, January 29.

Football Australia confirmed the date on Wednesday, with the A-League Men's fixture between the two clubs on the same date subsequently postponed.

The game will be held at GMHBA Stadium with AAMI Park as Western United are hosting Melbourne City in the ALM on the same day.

The Phoenix booked their spot in the final four with a dramatic penalty shootout triumph over ALM champions City earlier this month.

Teenage goalkeeper Alex Paulsen was the hero against COVID-ravaged City, saving three penalties in the shootout to put Ufuk Talay's team two wins away from the New Zealand club's first major trophy.

Victory ousted Cup holders Adelaide United in their quarter-final as Tony Popovic's team chase a second FFA Cup crown.

The ALM giants won the trophy in 2015 with a 2-0 defeat over Perth Glory in their only FFA Cup final appearance to date.

The winner of the clash at GMHBA Stadium will face Central Coast in next month's final after the Mariners defeated Sydney FC 1-0 in the first semi-final on Tuesday.

It's the first time the Mariners have qualified for an FFA Cup decider.