The contracts of cast members Teri Hatcher, Felicity Huffman, Marcia Cross and Eva Longoria expire when the current seventh season ends.
However, TV Line says that the four women are now very close to signing new deals.
The contracts, which would last for one year with an option for a second, would allegedly see the actresses earning $325,000 for each episode. If a ninth season does go ahead, their pay could rise to $350,000 per instalment.
Vanessa Williams, who joined the show earlier this season, is also expected to return for the eighth run of Desperate Housewives. ABC has not yet officially renewed the show.
Desperate Housewives creator Marc Cherry, who is currently working on a new pilot for ABC, has previously revealed that he believes the show should end in 2013.
Desperate Housewives airs on Sundays at 9/8c on ABC in the US and on Wednesdays at 10pm on Channel 4 in the UK.