NSW Waratahs coach Daryl Gibson believes the signing of former Melbourne Rebels playmaker Bryce Hegarty adds security and flexibility to his squad should incumbent five-eighth Bernard Foley feel the brunt of back-to-back seasons when he returns from a stint in Japan.

Hegarty, 23, was announced on Thursday as the final piece to the Waratahs' playing roster puzzle for season 2016 as they prepare for a trial match next weekend in Wagga and two more warm-up fixtures in New Zealand against the Chiefs (February 12) and Highlanders (February 19).

A starting five-eighth at the Rebels, Hegarty has been plying his trade in the Japanese Top League, but admitted he was unhappy in Melbourne.

Hegarty said he was looking forward to taking on the Rebels – should be named for the April 3 fixture – adding that he wanted to "teach them a lesson".