Phillip (18), a grandson of former referee Tommy Phillip, will meet up with the Football Otago Youth Development team in Coleraine.
The Otago group is led by coach Neil Mackenzie, who has attended eight Milk Cups.
"After missing out last year due to fundraising problems, I welcome a return to what I regard as a vital ingredient in football youth development," Mackenzie said.
"The inclusion of young Hamish will help his development as a very promising young match official," Mackenzie said.
Footballsouth referee development officer Chris Boyd sees Phillip's selection as a reward for his dedicated progress through refereeing ranks in recent years.
Phillip started refereeing in 2008, while still a pupil at King's High School. Boyd said the young whistle-blower was "taken under the wing" of Fifa assistant referee Brent Best, who provided early mentoring and support.
Phillip controlled his first second division club game in April 2009 and made his first appearance in a premier game as an assistant a month later. He refereed his first premier league game in May last year, was assistant referee in 16 premier games that season, and was later named most promising official at the Footballsouth awards.
Boyd said Phillip was a regular attendee at coaching and fitness training, and passed his level 2 referee theory course in August last year.
Phillip was appointed to the panel of referees for the national youth league, refereeing three games before being appointed to a semifinal between Canterbury and Waikato.
He is graded fourth on the referees list and third on the assistant referees list for all Footballsouth officials.
"Clearly, the experience of Milk Cup football can only benefit Hamish, as it did for other referees," Boyd said.
"Brent Best, now a Fifa official, and senior referee Dave Langley both rated the Milk Cup as a superb experience."
