Longleys next tournament with the national team was the 1990 FIBA World Championships were Australia delivered another poor showing. With Andrew Gaze (24.3 ppg) leading the team in scoring, finishing the fourth highest scorer at the tournament, the Boomers defeated Brazil in the first stage to advance to the quarterfinals. There they lost to both Puerto Rico (89-79) and USA, which featured Alonzo Mourning, Christian Laettner and Kenny Anderson, by a single point (78-79). The loss saw Australia fail to reach the medal rounds and finish in seventh place overall.

Longley was then selected for the Australia team that played at the 1992 Olympic Games in Barcelona. Alongside Larry Sengstock, Andrew Gaze, Phil Smyth, Andrew Vlahov and Mark Bradtke the team finished in 6th-place finish with a 4–4 record.

postseason surgery to his left ankle and the recovery time forced him to miss playing for the Australian Boomers at the 1996 Olympics in Atlanta.

Longleys last FIBA tournament with the mens national team came at the 2000 Summer Olympic Games in Sydney. There, in front of 14,833 fans at the Sydney Super Dome, Australia equalled their highest finish ever (fourth) after losing the bronze medal playoff to Lithuania (71-89).

Luc Longley was drafted by the Minnesota Timberwolves with pick #7 in the 1991 NBA Draft.

As a result of long contract negotiations that were still going on when the 1991/92 NBA season begun, Longley missed the first month of his rookie season. Longley then made his NBA debut for the Timberwolves on 30 November 1991. After two-plus mediocre seasons with the struggling franchise, the 7 ft 2 in (2.18 m) center was traded to the Chicago Bulls for Stacey King late in the 1993/94 season.

In Chicago, after Longley had played 55 games from the bench, Bulls coach Phil Jackson made him the starting center by the end of the teams 1995/96 season. As the Bulls starting center, he won three straight championships with the Bulls from 1996 to 1998, becoming the first Australian player to win an NBA title and the only player to have won three championships. This included being a part of the 1995/96 Bulls team, that set an NBA record for most wins in a regular season with 72.

Longley famously missed almost two months of the 1996/97 season after dislocating his shoulder while body surfing at Hermosa Beach near the teams hotel after a game in Los Angeles.

Following the breakup of the Bulls roster after the 1997/98 season, Chicago did a sign-and-trade deal with Longley, sending him to the Phoenix Suns for Mark Bryant, Martin Muursepp, Bubba Wells, and a conditional first-round draft pick.

Longley was later traded to the New York Knicks prior to the 2000/01 NBA season in what was only the second four-team trade in NBA history. The Suns acquired Chris Dudley as part of the deal together with a first-round draft pick from New York and an undisclosed amount of cash, while New York received Longley, Glen Rice, Travis Knight, Vladimir Stepania, Lazaro Borrell, Vernon Maxwell, two first-round draft picks (from the Los Angeles Lakers and the Seattle SuperSonics) and two second-round draft picks from Seattle. Seattle received Patrick Ewing and the Lakers received Horace Grant, Greg Foster, Chuck Person and Emanual Davis.

Longley spent one year with New York before retiring, due to a degenerative condition in his left ankle.

Longley played 567 games in the NBA. He averaged 7.2 points, 4.9 rebounds, and 1.5 assists per game over his NBA career.

NBA TRANSACTIONS:

- June 26, 1991: Drafted by the Minnesota Timberwolves in the 1st round (7th pick) of the 1991 NBA Draft.
- February 23, 1994: Traded by the Minnesota Timberwolves with a 1995 2nd round draft pick (Dragan Tarlać was later selected) to the Chicago Bulls for Stacey King.
- January 23, 1999: Traded by the Chicago Bulls to the Phoenix Suns for Mark Bryant, Martin Muursepp, Bubba Wells and a 1999 1st round draft pick (Metta World Peace was later selected).
- September 20, 2000: As part of a 4-team trade, traded by the Phoenix Suns to the New York Knicks; the Los Angeles Lakers traded Travis Knight, Glen Rice and a 2001 1st round draft pick (Jamaal Tinsley was later selected) to the New York Knicks; the New York Knicks traded Chris Dudley and a 2001 1st round draft pick (Jason Collins was later selected) to the Phoenix Suns; the New York Knicks traded Patrick Ewing to the Seattle SuperSonics; the Seattle SuperSonics traded Emanual Davis, Greg Foster, Horace Grant and Chuck Person to the Los Angeles Lakers; and the Seattle SuperSonics traded Lazaro Borrell, Vernon Maxwell, Vladimir Stepania, a 2001 2nd round draft pick (Eric Chenowith was later selected), a 2001 2nd round draft pick (Michael Wright was later selected) and a 2002 1st round draft pick (Kareem Rush was later selected) to the New York Knicks.
- September 25, 2001: Waived by the New York Knicks.