Trainer Kevin Barry says the WBO Heavyweight Boxing champion has been nursing pain and restriction in both his elbows for more than two years.
In November 2017, the team elected to have one of New Zealand's best orthopaedic surgeons Craig Ball, to correct the injuries.
The announcement was made on the eve of Parker's unification bout with Anthony Joshua in Cardiff.
"We're pretty transparent, we've got nothing to hide, especially given it was so damn successful," Parker's promoter David Higgins said.
