Friend made 17 appearances in his debut season with the Warriors, missing five games after breaking his jaw against Brisbane and then the final two matches of the year following his shoulder injury.
"It's frustrating but all I can do is to have the operation, repair the nerve and do all I can to be ready as soon possible,'' he said.
"I've been through disappointments due to injuries before. It was tough being out after breaking my jaw last year but you get over it, get on with your recovery and fight your way back. That's what I'll be doing again as well as supporting the boys throughout the trials and the start of the season.''
The Warriors start their trials programme in just nine days, facing the Gold Coast Titans at Pizzey Park, Burleigh Heads on Saturday, February 9.
They then meet Penrith in Hamilton on Saturday, February 16 and Brisbane in Dunedin on Saturday, February 23 before their first-round encounter with Parramatta at Parramatta Stadium on Saturday, March 9.