The 23-year-old will play the remainder of the winter football season in Wellington, but will continue to live in Dunedin.
He has transferred from Mosgiel to Petone and will fly up every weekend for the final two months of the Central Premier League.
It comes after a stellar Southern Premier League season which has included three hat-tricks, one of which he scored eight goals in against Northern.
He had been similarly impressive for Southern United, scoring four goals in 13 matches in the national premiership.
Brook, a quantity surveying student at the Otago Polytechnic, admitted to being "a bit surprised" when he received the call from Petone.
It had been a tough decision, as Mosgiel was in a position to challenge for a second SPL title, while he was also the front-runner for the golden boot.
But it was an opportunity he could not pass on.
While he felt the SPL was a good league, the Central league was another step up.
"It’s a lot higher of a league up there," he said.
"Just pretty much wanting to play against, there’s heaps of Team Wellington players and good national league players in that league.
"I just want to get up there and prove I’m as good as, or can compete with, the best players in the country."
Brook had a horror run of injuries for several years, although prior to picking up a hamstring niggle last week, has been relatively healthy this year.
That niggle kept him out of last weekend’s game, although he went to meet the team.
He will debut against North Wellington on Saturday.
Petone would help cover his flights, while he would stay with team-mates both to save on accommodation costs and
to get to know the players better.
While he still has national premiership ambitions, he said Southern United’s absence from this summer’s league did not come into the decision.
It would help him be seen by other teams — notably Team Wellington.
However, if that did not eventuate he would look into joining the Canterbury United team, which was to include Southern and Tasman United players.
He is not the only player Mosgiel has lost.
Students Aidan Barbour-Ryan and Luke McKay have answered SOS calls from their junior club, Selwyn.
Selwyn is in a relegation battle in the Mainland Premier League and the duo have returned to help it stay
up.
