Club owner Clive Palmer has thrown open the gates for free entry for the third versus fourth-placed fixture at Skilled Park and Mensink says that early indications are that a very strong crowd will be present on Sunday.
"If I am honest, and everything including the weather works out well on Sunday, then a sell-out would be perfect," he told the Gold Coast Bulletin.
"But I have to be a realist, so we will definitely get 10,000 fans there and we should have 20,000 by the end of the week.â€ť
A-League boss Lyall Gorman said the competitionâ€™s hierarchy would be watching the crowd figure with curiosity.
â€śWe are not living and dying by the crowd numbers at all, so we are not wedded to a certain number or target," he said. "We will just be watching it with interest.â€ť