Sydney are very confident they will be able to rebuild and get Lance Franklin back to his best for the 2021 season.

Franklin missed the entire 2020 season after injury setbacks kept him from strutting his stuff in hub life.

The 33-year-old has had some serious doubts over whether he will ever be back to his best.

Sydney are confident they have found a program to help get their star man back on the field and primed to deliver plenty of goals.

"Our main aim at the moment is getting him really strong through the core," Sydney coach John Longmire told SEN radio on Monday.

"He's such a big man and we want to make sure he's really strong through that area and he gets himself in the best possible shape and has the strongest possible foundation before we get to the real strong running phase, which we hope will be in January."

Franklin signed a monster nine-year deal when he moved from Hawthorn to the Swans, with two years still to run on his contract.

Franklin has only played 10 games in two seasons and the Swans will need him to find his best again to ensure the deal goes down as a success.

"We took him away with the aim to having him playing this year," Longmire said.

"This time last year he was absolutely flying, so we had high expectations that he'd get back and play.

"But we were over in Perth (in August) and there was a training session there where he just pulled up a bit sore and we said that's enough now.

"We needed to try and make sure we reset him and get him really strong to see how he can go for a tilt at the 2021 season."