DETROIT ? The NFL served notice Friday that it is taking its commitment to diversity seriously, fining Detroit Lions president Matt Millen $200,000 for not interviewing any minority candidates before hiring coach Steve Mariucci.

Commissioner Paul Tagliabue sent a letter to Millen informing him of the fine, the first levied under the league’s diversity program.

After coach Marty Mornhinweg was fired by the Lions in January, Mariucci was the only person interviewed for the job. The team said five minority candidates turned down interviews because it appeared inevitable Mariucci would be hired.

“While certain of the difficulties that you encountered in seeking to schedule interviews with minority candidates were beyond your control, you did not take sufficient steps to satisfy the commitment that you had made,” Tagliabue wrote.

The commissioner told NFL teams in May that future failures to interview minority candidates for a head coaching opening could lead to fines of $500,000 or higher as “conduct detrimental” to the NFL.

Team spokesman Bill Keenist said the Lions “respectfully disagree” with Friday’s ruling, but supported initiatives to promote diversity on coaching staffs and in front offices.

Keenist said Millen would have no comment.

There currently are three black NFL head coaches: Herman Edwards of the New York Jets, Tony Dungy of the Indianapolis Colts and Marvin Lewis of the Cincinnati Bengals.

The NFL has been trying for years to increase minority presence at its highest levels. The league intensified its attack on the problem after advocates announced last year they might sue if the NFL didn’t hire more black coaches.

Detroit Lions CEO Matt Millen addresses the media in this file photo. Millen was fined 00,000 by the NFL Friday for not interviewing any minority candidates before hiring coach Steve Mariucci.

League owners agreed in principle in December that any team seeking to hire a head coach would interview at least one minority candidate. The exception would be when a team makes a commitment to promote one of its assistants.

Known as the “Rooney Rule,” it is named after Pittsburgh Steelers owner Dan Rooney, chairman of the league’s diversity committee.

“With today’s announcement, the ‘Rooney Rule’ has finally arrived,” said Kellen Winslow, executive director of the Fritz Pollard Alliance.

The alliance, formed in March and named after the first black coach in the NFL, represents the first time the league’s minority coaches and executives have banded together to fight for equal opportunities for minority members of the NFL’s coaching and front office ranks.

“I am happy to applaud the league for making the ‘Rooney Rule’ enforceable, which is a major step in leveling the playing field in the NFL,” said Winslow, a Hall of Fame tight end. “We are pleased that the rule now has teeth and hope today’s announcement sends a strong message to owners to embrace inclusive hiring practices going forward.”

At the time of Mariucci’s hiring in February, Rooney and Gene Upshaw, the executive director of the NFL Players Association, criticized the Lions for failing to follow that new policy.

“The Detroit Lions gave mere lip service to the agreed-upon minority hiring process, treating it almost as if a nuisance to their hiring of Steve Mariucci,” Upshaw said at the time. “The minority candidates were never given a fair chance to interview. In this case, the Lions’ position is indefensible.”

Lions vice chairman Bill Ford, Millen and three other Lions executives met in March with the league’s diversity committee in Palm Beach, Fla., to explain the process that led to the hiring of Mariucci.

Previous big fines handed down by the NFL include $500,000 paid by the San Francisco 49ers in 1990 when, without notifying other NFL team owners or getting league permission, owner Edward DeBartolo Jr. made the 49ers part of the same corporation that owned the NHL’s Pittsburgh Penguins. That was a violation of the rule against an NFL team having an interest in another pro sport.