AFL IS another step closer to being played at Adelaide Oval, with the SANFL and SACA signing letters of intent to signify their commitment to the half-a-billion dollar project.

Late last year the AFL, SANFL and SACA signed an in-principle agreement, which will see Australian football played at Adelaide Oval by 2014.

The South Australian Government pledged $450 million to the controversial venture and gave the sporting bodies until July 1, 2010 to reach an agreement for the inner-city site.

Further research and investigation into the costings and intricacies of the project prompted the government to increase its contribution to $535 million and extend the initial deadline for the agreement until August 31.

Tuesday marked that extended deadline and South Australian Infrastructure Minister Pat Conlon said there would be no going back from here.

"It's true, that this is not a done deal yet, there are challenges to meet and they need to be addressed," Mr Conlon said on Tuesday.

"There will be no further delays."

There is still an issue over carparking and just who will fund the extra $50 million needed to construct a car park capable of meeting the demands of patrons visiting the stadium capable of holding 50,000 patrons.

Mr Conlon said the SA Government would continue to work with the Stadium Management Authority to resolve the issue of carparking and any other problems standing in the way of the project going ahead.

"To say we haven't made progress is to be completely ignorant of the giant strides that have been taken. We acknowledge there are funding issues to be addressed, (including) $50 million for carparking," he said.

"(But) any remaining funds that need to be found are dwarfed in size by the state government's contribution.”

SACA, SANFL and the Adelaide and Port Adelaide Football Clubs will seek formal approval from their combined 80,000 members by December.

The Power have been outspoken in their enthusiasm for a move to Adelaide Oval.

The Crows, who recently invested $25 million in a new training and entertainment facility at AAMI Stadium, have been more measured in forming an opinion but are now also in full support of the project, having been convinced their “non-negotiables” can be met.

A recent survey of Adelaide members showed the majority were against a move to Adelaide Oval.

The Crows do not need a vote to proceed with the relocation, but chief executive Steven Trigg said he would attempt to try and convince the supporters that a move to Adelaide Oval was in the best interest of the club.

“We’re convinced this would be a great opportunity for us,” Trigg said.

“Of course there are many unconvinced members because we haven’t been able to talk to them properly.

"We’ve only got ourselves in a position now where we have a clear understanding ourselves to be able to speak sensibly. I’m very confident that we can paint a picture… that would be of benefit to our supporters.”