"I hope he remains in Major League Soccer and continues his career in the United States; sitting here today I'm not sure that that will happen," said MLS Commissioner Don Garber, speaking in New York at Reuters Global Media Summit.
Beckham is at the end of a lucrative five-year contract, which made him the highest paid player in the league. His average annual compensation during his contract was $6.5 million.
Beckham's team, the L.A. Galaxy, won the MLS Cup championship earlier this month. Garber said he spoke to Beckham at length after the game but it was down to his talks with LA Galaxy owners.
Beckham, arguably the biggest star to play the game in the United States since Brazil's Pele signed in 1975, has said he would make a decision once the MLS season concluded.
Paris Saint-Germain, which is backed by a wealthy Qatari owner, has reportedly offered Beckham an 18-month deal worth roughly $17.9 million, according to the Daily Mail.
Beckham has shouldered high expectations since agreeing to join the MLS five years ago, and the relationship between star, league and fans has run into rough spots along the way. But the 2011 season was seen as a validation of the experiment, with Beckham playing well and the L.A. Galaxy winning the title.
"It's been a great five-year experience for us, he's delivered on all the expectations that we've had," said Garber, who was named commissioner in 1999 after spending 16 years in the NFL's front office.
Since 1999, Garber has added nine new expansion teams, including Montreal next season, and overseen a sharp rise in attendance and TV ratings. Last season, the average attendance for MLS games rose 7 percent, and at 17,800 is now higher than the average attendance at National Hockey League or National Basketball Association games.
The league recently signed a three-year TV deal with Comcast Corp's NBC Sports Group worth roughly $10 million a year. Its contracts with both that company and Walt Disney Co's ESPN expire following the 2014 season.
While Garber said he would look at the next round of deals as the current ones moved closer to expiration, he added that MLS would consider starting its own soccer network, following in the footsteps of the NFL, NBA and Major League Baseball.
Soccer's popularity in the U.S. is climbing, and Garber said the league will eventually be successful and popular enough to launch its own stand-alone soccer channel similar to News Corp's Fox Soccer Channel.
Meanwhile, the league is continuing to expand its roster of teams in the United States and is currently looking to add a second soccer team in the New York City area to join the New York/New Jersey Red Bulls, Garber said.
"We are working closely with the city, trying to find sites to build the stadium, I think it will be a record franchise fee paid for that team," he said.
