Griffiths was spotted at training on Tuesday and coach Miron Bleiberg is ruling nothing out at this stage.

With one remaining spot left on the roster after season-ending injuries to Adama Traore and Daniel Piorkowski, Bleiberg is set to talk with the former Newcastle Jets star in the coming days to determine his future.

Griffiths left Gold Coast to play in Saudi Arabia with Al Shabab in a deal worth $1.2 million a season; however a move back to United would need to see him take a significant pay cut under salary cap restrictions.

"Me and Adam will talk later today, he trained yesterday and today and I said for him to train at least twice to see how he feels, tomorrow we will know more," Bleiberg said.

"He'll (Griffiths) do a fitness test tomorrow. If he is very fit he is a huge boost and if he wants to stay it's a huge boost, but if he doesn't want to stay then it's no boost at all."

In further good news, Gold Coast captain Jason Culina, who twisted his knee in the 5-1 win over rivals Brisbane, resumed full training and looks likely to play against Adelaide on Saturday night.

With his troops evenly poised in third place and returning fresh from a week off the track, Gold Coast Bleiberg has declared that the next three games against Adelaide, Newcastle and Sydney will define his side's season.

After notching up back-to-back wins and the top-two of Sydney and Melbourne still to play, United's chance of reaching the much coveted top spot lies squarely in their own hands.

"We have a very important week coming ahead of us, a week which will probably determine our season," Bleiberg said.

"I've always maintained that we have the playing quality, but if we have the attitude right and the fitness right, then the sky's the limit.

"There is no more motivation than this, in an ideal world I'll be happy with three wins and nine points, and in a less ideal world I'll be happy with seven points."

Bleiberg was taking no prisoners at training as he looks to strengthen the side's fitness for the important run home, saying he thought the side emerged a little too relaxed from the festive break.

"The boys enjoyed the festive season holiday, so they might as well work hard to compensate for it," he added.

"They are not as fresh as I want them to be, they had a big day today (Tuesday) and tomorrow (Wednesday) they will have a double session.

"The attitude now is that you give your maximum in training and maximum in games and hopefully the results will go our way."