Adelaide United insist striker Bruce Djite will play in the A-League grand final despite not training on Thursday with his team-mates.

Djite, who has scored six goals in his past four matches, did running and agility exercises as United's squad trained at their Elizabeth base.

"I hope he can play, he is very important for us and I hope he can score a couple of goals again," midfielder Marcelo Carrusca told reporters after training.

"He's fine."

Djite, who has been troubled by groin soreness, also trained separately from United's main group on Tuesday, as the Reds nursed their form attacker ahead of Sunday's decider against Western Sydney Wanderers at Adelaide Oval.

United added Mark Ochieng and Mate Dugandzic to an extended 18-man squad announced on Thursday, with two players to be omitted for the finale.

More than 46,000 tickets have been sold for the grand final, which Carrusca expects to be a tight affair - similar to the three draws between the clubs this season.

"It's going to be a difficult game, we know," he said.

"They have good players so we have to be focused when we have the ball, try to create chances and score.

"It's going to be a final where it's difficult to score many goals but you never know - anything can happen.

"They are a tough team ... it's difficult to create chances but we believe in us; we trust that we can beat them."

Meanwhile, hundreds of supporters have turned out in Parramatta for the Wanderers fan day.

The Wanderers' players mingled with the club's fans, posed for photos and signed autographs ahead of the season decider.

The Wanderers have a light session at Parramatta Stadium on Thursday afternoon before flying to Adelaide on Friday.

AAP/ABC