FORT LAUDERDALE, Fla. (AP) _ New York Yankees owner George Steinbrenner and city officials have signed a contract that will keep the team in Fort Lauderdale for spring training through 1990.

The contract, signed Thursday, took nearly two years to complete. One complication was seesawing negotiations between the Yankees and nearby Coral Springs concerning terms of a contract for the team's new minor league training complex.

The Yankees said that if a contract with Coral Springs is signed, the two- year pact with Fort Lauderdale automatically will be extended to five years.

The contract signed Thursday calls for the team to use Fort Lauderdale's Yankee Stadium for practice and to play at least 14 exhibition games against other major league teams. The Fort Lauderdale Yankees, the club's Florida State League farm team, also will continue to use the stadium.

---

EL SEGUNDO, Calif. (AP) - Defensive tackle Malcolm Taylor, a starter in the Los Angeles Raiders' recently utilized 4-3 defense, was downgraded to doubtful for Sunday night's game at San Diego.

Taylor is sidelined by a sprained ankle and has not been able to practice. He'll be replaced by rookie defensive end Scott Davis, with right end Mike Wise moving inside to Taylor's spot.

The Raiders also indicated Thursday that center Bill Lewis, bothered by a recurring sprained ankle, would not start against the Chargers. Lewis spent two days in the hospital for tests and sought additional medical advice before returning to limited duty at practice Thursday.

Coach Mike Shanahan said left guard John Gesek would start at Lewis' spot, while Chris Riehm would move into the lineup at left guard.

It will be the sixth different line combination used by the Raiders in the last 10 games.

Shanahan also said that tight end Todd Christensen, five times a Pro Bowler, would return to limited duty against the Chargers after a month on the sidelines. Christensen suffered a partial tear of the joint capsule behind his left knee and missed four games.

Christensen has had remarkable success against San Diego during the past six seasons, as seven of his 14 100-yard receiving games have come against the Chargers.

---

RICHFIELD, Ohio (AP) - The Cleveland Cavaliers have placed rookie forward Gary Voce on the injured list because of back spasms, bringing their roster to the NBA regular-season limit of 12.

The 6-foot-9 Voce played for the Cavaliers in the Central Division Summer League and was then invited to their fall training camp.

He led Notre Dame with 7.7 rebounds per game and was second in scoring with an average of 11.2 points per game last season. He played professional basketball in Puerto Rico during the summer before joining the Cavaliers.

He must remain on the injured list for at least five games.

The Cavaliers open their season tonight in Charlotte against the expansion Hornets.

The Cavaliers' roster:

Centers Brad Daugherty, Tree Rollins and Chris Dudley; forwards Larry Nance, Mike Sanders, John ''Hot Rod'' Williams, Phil Hubbard and Randolph Keys; and guards Ron Harper, Mark Price, Darnell Valentine and Craig Ehlo.

---

MILAN, Italy (AP) - Two world title fights between Mexican holders and Italian challengers have been postponed because of illness and injury reported by the Mexican side, Italian organizers said today.

The bout for the International Boxing Federation (IBF) featherweight title between world champion Jorge Paez of Mexico and Maurizio Stecca, scheduled to take place on Nov. 26, was put off indefinitely after Paez hurt his left hand in training.

The World Boxing Council (WBC) super-bantamweight title fight between Daniel Zaragoza and Valerio Nati, scheduled for Nov. 12, was put back to Nov. 26 because Zaragoza, the world champion, has an intestinal infection.