FREMANTLE midfielder Harley Bennell has suffered yet another calf muscle injury, continuing a summer of woes for the Dockers.

PerthNow understands that Bennell has suffered a strain in his left “good calf” - the opposite one to that which kept him out of football for almost all of last season.

Club sources have described the setback as minor but it adds still more concern to Bennell’s durability.

The club claimed confidence that Bennell would be available for selection for round one of the 2017 season, but also confirmed they would see more advice on how to treat Bennell’s suspect calves.

He will travel to Munich to see Dr Hans-Wilhelm Muller-Wohlfarht after he suffered the “minor” strain in his left calf at training last Friday.

Dr Muller-Wohlfarht has previously treated Collingwood’s Ben Reid and Geelong’s Max Rooke for soft tissue injuries and has also worked with the world’s fastest man Usain Bolt.

“Harley will travel to Germany next month to consult Dr Muller-Wohlfarht and we are positive about him being available for selection in round one of the 2017 season,” Dockers football manager Chris Bond said.

The 24-year-old managed just one NAB Challenge match and one WAFL game for Peel Thunder last season, coming to the club with a pre-existing calf problem.

He has been missing from running drills at recent Dockers sessions and was spotted at one session using a scooter, which players regularly use when in rehabilitation from injuries.

He was seen on track using a scooter following today's training session, with Michael Johnson, who has been charged with assault, also sighted.

Veteran ruckman Aaron Sandilands ran laps, as did Hayden Crozier, Cam Sutcliffe, Zac Dawson, Nick Suban and Michael Walters.

Speaking on the AFL website, Fremantle list manager Brad Lloyd said Bennell had been ticking every box before the latest setback.

“I think it’s a slight strain. We still feel like he’ll be available for round one," he said.

"He’s a monster trainer the way he goes about it. He trains really hard when he’s at the club.

"He just looks to be holding up well and was moving well until his slight setback, but it does appear minor.”

Bennell had joined Fremantle at the end of the 2016 season after playing 81 games for Gold Coast over five seasons, establishing a reputation as one of the most gifted young midfielders in the competition.

But he had also established a reputation as being prone to injury and off-field misadventure, managing 15 games in each of his last three seasons at the club due to a combination of injuries and off-field issues.

News of his latest calf problem comes as the club learned this morning that Michael Johnson would be charged with assault following an altercation with Bunbury school teacher in a Leederville kebab shop in the early hours of Sunday morning 12 days ago.

Another Docker, Shane Yarran, faces charges of assault against a family member from the same weekend.