PORT Adelaide star Robbie Gray is "absolutely humming" and "killing it" as the star forward ramps up his training after a cancer scare.

Gray underwent surgery for testicular cancer in September before having chemotherapy as a precaution.

The 29-year-old has been training for the past few weeks, and completed the majority of Wednesday's session at Alberton Oval.

"Robbie's been absolutely humming, he's been doing really well," Port Adelaide's high performance manager Ian McKeown said. 

"He's got over the troubles that he's had over the last few months and (is) trying to back up an incredible season as well, so he's in a really good spot. 

"He was in training, then he did some modified running at the end just to top him up." 

Gray made a successful move from the midfield to a permanent small forward role in the 2017. 

He booted 47 goals for the season, was second in the League for goal assists (30) and averaged 19 possessions per game. 

"He's in the drills and he's killing it," McKeown said. 

"He's doing what he needs to do. It's very exciting to see him. It's not something that keeps me up at night, worrying about Robbie."

McKeown said the Power was carefully monitoring Gray to see if he needed a break as a result of the chemotherapy treatment. 

"It's the systemic fatigue and the barrage that it takes on your body overall," he said.

"There are a lot of experts around me and around Robbie that provide that information. 

"We action upon it ruthlessly whereas (with other players) we might have kept pushing." 

McKeown said Gray would be physically fine for the JLT Community Series, but it would be a coaching decision if he played, given there are only two games in the pre-season. 

Gray typically doesn't play much during the pre-season as he manages his body. 

The Power are also being careful with defenders Matthew Broadbent, Darcy Byrne-Jones and Jasper Pittard. 

Broadbent is still struggling with an ankle injury that forced him to miss the back-end of last season. 

Byrne-Jones and Pittard have groin issues.

"It's a slow burn with Matty (Broadbent)," McKeown said.

"It's been one of those that has been very difficult and we have to manage it day by day.

"We want to bring him along in a relatively conservative way. 

"(Byrne-Jones) has had long-term groin pain.

"It's incredibly important that we do not let him go too far because you're very close to the edge of a very steep cliff.

"If you go over that, it takes a very long time to get back."