The Brumbies will have an answer to Will Skelton next season after recruiting giant second row Rory Arnold.

At 2.08m, Arnold would tower over Waratahs man-mountain Skelton and everyone else in the Super Rugby, to join former Stormers lock Andries Bekker as the tallest player in the competition's history.

He will offer a lot more height to a Brumbies second row where Sam Carter and Jack Whetton were the two tallest players at 2.00m last season.

Arnold has enjoyed a rapid rise having only seriously taken up union three years ago, but his development has been stalled by shoulder reconstruction surgery in the last 12 months.

However he is optimistic of a return before the end of the National Rugby Championships, which will give him time to convince Brumbies boss Stephen Larkham that he is worth a spot in the Super Rugby squad.

"I love the physicality, that's how I injured my shoulder ... trying to whack people," Arnold told the Canberra Times.

"At the moment I'm 130 kilos, but I think I'll have to lose a few and get down to maybe 126kg or so.

"I was just playing rugby for fun for the first two years, just a bit of bush footy.

"I've always been tall, but when I left school I shot up. I've still got a lot to learn and I've already picked up a lot.

"I wasn't really interested in basketball because there was no contact ... I've got a twin brother who's just as tall and we were both leaguies.

"It would be awesome to get a couple of caps next year, and just to get fit. I just want to give myself the opportunity to play."