Retallick has been out of Super Rugby for eight weeks, recovering from a wrist injury.
Retallick said it had been tough watching on but he had used the time wisely.
"Eight weeks has been kind of a good in hindsight, especially around my fitness and my body and stuff like that. So yeah I don't think fitness should be an issue. Thanks to the trainers here, for the last eight weeks I've just been running up and down the sideline," he said.
The 28-year-old said he had been doing a lot of skill work in the last couple of weeks.
