Cowboys Pro Bowl DT Leon Lett was suspended eight games by Commissioner Paul Tagliabue yesterday for violating the NFL's substance abuse policy for a fifth time. Lett, 30, who has been suspended since June 4 after failing a drug test, is eligible to rejoin the team Nov. 9 and play in the Nov. 14 home game against the Packers if he complies with his treatment plan. Lett couldn't be reached to comment. Jim Steiner, Lett's agent, didn't return calls.

In deciding to suspend Lett for eight games, Tagliabue said he took into account the player's clean record since 1997 and his willingness to participate in testing. Lett would be suspended for a year for another violation, Tagliabue said. . . .

Meanwhile, Cowboys LB Quentin Coryatt will miss the season with leg and shoulder injuries. Coryatt, who signed with Dallas on April 17, has a ruptured Achilles' tendon and a recurring shoulder injury.

PACKERS SIGN PUNTER: The Packers signed veteran free agent P Louie Aguiar, 33, and waived rookie P Chris Hanson.

The Packers have been without a dependable punter since veteran Sean Landeta signed with the Eagles early in the offseason.

Green Bay drafted Josh Bidwell in the fourth round last April, but lost the rookie for the season when doctors discovered he had testicular cancer.

AMERICAN BOWL SET: The Cowboys and Falcons are scheduled to play a preseason game in Tokyo next season, the 10th NFL game to be played in Japan.

The game, the 2000 American Bowl, is set for August at the Tokyo Dome. The specific date hasn't been determined. The NFL's last visit to Tokyo was in 1998, when the Packers beat the Chiefs, 27-24, in overtime.

EXTENSION FOR MATHIS: The Falcons signed WR Terance Mathis to a contract extension, and FB Bob Christian and DT Travis Hall to multiyear contracts, the Atlanta Journal-Constitution reported.