His older brother plays in the NRL for the Sharks and his league loving father constantly hounds him to switch back to the 13-man code, but boom Waratahs lock Kane Douglas is in no doubt as to where his future lies.

The 20-year-old, who has been a revelation in the opening five rounds of the Super 14 season after making his debut off the bench against the Reds in Round 1, inked a two-year deal with the Waratahs on Tuesday.

A member of Australia's Under 20's side last season, Douglas, who hails from Yamba on the far north coast of NSW, considered a strong offer from the Melbourne Rebels before deciding to remain in Sydney.

"I gave it (the Rebels offer) a bit of thought, but deep down I probably wanted to stay, I like it here," Douglas said.

"My mum and dad just moved down (from Yamba) recently so it's pretty good. I like the coaches and the players here and I think we've built a good team."

Asked to explain how he and his brother Luke, who plays his 100th game for Cronulla on Saturday night, ended up playing rival codes, Kane replied: "My dad (Chris) used to play rugby league so I've played league since I was five or six and I only started playing rugby when I was 15 and (Luke) never really played much (union). He played at school for a little bit but that's about it."

While always confident he could force his way into the Waratahs line-up this season despite the arrival of former emerging Springbok Hendrik Roodt and New Zealand born lock Cam Jowitt, Douglas admits he has already exceeded his own expectations.

"I thought maybe I could get a few games, I thought I was good enough, I just needed to put it on the park. I probably didn't expect to get the first five games out and then get named in this week as well," he said.

"It's a bit surreal it's a pretty good feeling though, I can't really explain it."

Having already held his own against Bulls and Springboks second-rower Victor Matfield in the Waratahs' narrow loss in Pretoria last month, Douglas welcomed the challenge of locking horns with Western Force captain Nathan Sharpe this Saturday.

"It will be good, he's a good player," the youngster said of the 79-Test veteran.

"To be honest, I just go out there and play my own game and then if I get a chance to go up against him, maybe put a hit on him or something ... I'll just see what happens."

Douglas could very well find himself packing down alongside Sharpe in a Wallabies jumper in the coming months, with Reds skipper James Horwill to miss the entire domestic Test season with a knee injury.

But the level-headed youngster insists he's not looking too far into the future.

"It will be good if I could (crack the Wallabies this season) but I'll just try my hardest for the Waratahs first and try and get a few games out and stay consistent," he said.