Matich said staying in Northland would mean he can be nearer to his family at this difficult time, something his father would be grateful for.
"I think my dad's really happy about it, he's needed some boys up here. My other two brothers came over from Perth, one's heading back but the other will probably stick around until New Year's."
Nock described Matich as a "rock star" after he put on a strong showing at Monday's training.
"He fronted up at the first training and mate, he's a rock star, I can't speak highly enough of him," said Nock. "He just adds something to the team. There's real commitment in the team and I think Matty has set the bar."
Some of the players admired Matich's mana after agreeing to fill what was effectively his brother's spot in the squad, said Nock.
The team currently has an exciting feel to it and he believes they will be up to national standard come the National Provincial Rugby Sevens Tournament in Queenstown in January, Nock said.
"The team has a real local feel to it which has excited the boys. It's a fair comment that in the past there have been a lot of imports, but this year we are a bunch of brothers."
Nock confirmed Matich's transfer from Auckland's Sevens team was complete and he was all go for Northland.