PHOENIX, Ariz. (AP) _ Five-time National Basketball Association All-Star Walter Davis, who has been undergoing treatment at a California drug and alcohol clinic, will be released in eight to ten days, according to a team official.

The clinic in Pasadena, Calif., is expected to release Davis between Jan. 10 and Jan. 12, Suns General Manager Jerry Colangelo said Thursday.

Colangelo said that Davis, who entered the clinic Dec. 12, would not rejoin the team before the Jan. 13 home game against the San Antonio Spurs. He said the 6-foot-6 guard would have to ''run through a few practices'' before suiting up for a game.

The Suns have said only that Davis is undergoing treatment for abuse of drugs, alcohol, or both.

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LANDOVER, Md. (AP) - Washington Bullets center Jeff Ruland, who broke his right ankle in a National Basketball Association game Dec. 11 at Detroit, had his cast removed and will now begin therapy, the team doctor said Thursday.

Dr. Steve Haas said Ruland will be re-evaluated in a week.

Ruland was ranked among the NBA's leaders in scoring when he was knocked out of action. He was averaging 21.2 points and 12.1 rebounds a game, and led all NBA centers and power forwards in assists with an average of 5.8 per game.

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SUVA, Fiji (AP) - Fijian cruiserweight Aisea Nama, ranked 16th by the World Boxing Council, has been banned from fighting in both Australia and Fiji after being knocked out twice in 48 hours.

Nama was banned for six months and put on a six-month good behavior bond by the Fiji Boxing Council. The ruling came Thursday.

Late last month, Nama was banned from fighting in Australia for 12 months by the Victorian Professional Boxing Control Board.

The bans followed revelations by The Daily Telegraph in Sydney, Australia, that Nama had broken the rules of both organizations by fighting in Melbourne, Australia, two days after being knocked out in a contest in Suva.

Nama lost his Fijian heavyweight title to Niko Degei on Dec. 14 when he was knocked out in the ninth round.

Two days later, Nama suffered a first-round knockout against Australian heavyweight champion Dave Russell.