The proposed refit of Adelaide Oval hinges on a vote from 19,500 SACA members on May 2.
The proposal needs to receive a 75 per cent-majority vote for it to go ahead.
The SANFL, Crows and Power have written to members to update them of the design's progress and also with the hope of convincing members, who might also be members of the SACA, to vote 'yes' at their referendum next month.
Both South Australian-based AFL clubs reported financial losses last year and are being disadvantaged by stadium deals at AAMI Stadium, which saw them ranked 15th and 16th in the competition in stadium yield in 2010.
The clubs are also suffering from dwindling attendances at the venue.
The South Australian government has committed $535million to the proposed redevelopment of Adelaide Oval and insists it wont spend another cent on AAMI Stadium, which is in need of an upgrade, if the proposal doesn't go ahead.
The Crows and Power are expected to be up to $8million a year better off under the proposed move to the inner-city venue.
SANFL executive commissioner Leigh Whicker said the three football organisations were unanimous in their support for the Adelaide Oval redevelopment.
"The SA Football Commission and League directors, together with the executive and the boards of the Adelaide Football Club and Port Adelaide Football Club, are unequivocal in their belief that a vote for the proposal will deliver a number of crucial benefits," Whicker said in a statement on Wednesday.
"Together, we urge any football lovers, who may also be SACA members, to vote yes for the future of football and cricket and for South Australia as a whole."
Port Adelaide has been outspoken in expressing its desire to relocate to Adelaide Oval, since the idea was raised back in 2009.
The Crows opted to reserve judgement until they had all the necessary information, but chief executive Steven Trigg endorsed the proposed move on Wednesday.
Adelaide has faced opposition from a section of its supporters, with over 6,000 signing a petition to stay at AAMI Stadium.
Trigg acknowledged the division among supporters, but said it was in the best interest of the club to play games at Adelaide Oval.
"The Adelaide Football Club has been unashamedly diligent in working through the issues about a move to play games at a redeveloped Adelaide Oval," Trigg said.
"We have said - right from day one - that we will only support a move to Adelaide Oval on behalf of all our stakeholders, if we are significantly better off.
"We have now concluded that we will be and we are urging any of our supporters who can vote on the SACA proposal, to vote yes."
The Power have established a debt reduction campaign, with the aim of eliminating a core debt of $3million.
Chief executive Mark Haysman said the move to Adelaide Oval would help the club re-establish itself as a sustainable business.
"We want the SACA members to vote yes. For the Port Adelaide Football Club, the move to Adelaide Oval would change our world and only for the better," Haysman said.
"This is a very exciting opportunity not just for the Port Adelaide Football Club, but all of football, cricket and for South Australia as a whole."
Katrina Gill covers Adelaide and Port Adelaide news for afl.com.au. Follow her on Twitter: @AFL_KatrinaGill
