Recent heavy downpours in Perth have badly affected the nib Stadium playing surface putting the high-profile clash with the Scottish club in jeopardy.

Although a multi-million dollar redevelopment is scheduled to occur over the next 18 months, nib Stadium's current drainage is particularly poor and the playing surface is still being affected by an extremely high level of water just below the ground.

The playing surface was virtually a lake when South Sydney played the Broncos at the venue on June 24 following a record-breaking downpour in Perth and according to stadium management, that water has simply sunk below the surface.

With the weather clearing up, Allia Venue Management have been using industrial fans to dry the surface and even brought in two helicopters on Wednesday morning, which hovered over the pitch for at least two hours.

Heavy industrial rods designed to extract water from the ground will be sunk into the areas still affected later on Wednesday, with officials from Glory and Celtic to make a decision on Thursday morning on whether the stadium is fit to host the match.

"It's a little bit different than yesterday," said chief executive Paul Kelly, whose inspection of the surface on Tuesday apparently prompted the frantic work over the last 24 hours.

"I think where we're at is that three quarters of the area that's in jeopardy will be OK.

"There's probably another quarter that's still very soft underfoot and it's got water, not on the top, but it's retaining water underneath, so at this moment in time there's still a lot more work to be done on that and we can't make a call until such time it happens.

"But I'm 90 percent sure the game will be here, it's just that one area that needs a lot of work.

"Celtic will have to come down and have a look themselves at the pitch but I'm sure they've played on far worse pitches in far north Scotland."

Kelly said he would be making calls to Patersons Stadium and the WACA on Wednesday afternoon in a desperate bid to arrange a Plan B if nib Stadium is unavailable.

A WACA spokesperson said the very latest they would need to know was Thursday morning as catering, security and parking needed to be arranged, especially as the WACA Ground's usual Trinity College car park is also too sodden to be used.

Celtic manager Neil Lennon expressed his hope the ground would dry out in time.

"I was made aware of it yesterday," said Lennon from training at the WACA today. "I spoke to (Glory owner) Tony Sage, last night so he was quite confident that it should be OK.

"Obviously we want to play it at the stadium because it will create a really good atmosphere."

Allia Venue Management boss Nick Tana admitted the company could have reacted quicker to the situation, but stadium chief executive Peter Bauchop maintained his belief the ground would be ready for the game.

However Bauchop admitted the surface had been so wet that heavy machinery hasn't been able to get out onto the ground to remove the posts from the NRL match almost a fortnight ago.

"Our confidence is increasing dramatically as each hour goes by," Bauchop maintained.

"And the key for us is that we've never ever had to cancel an event here at the stadium and this is definitely not going to be the first if we can do anything about it."