David Beckham has been warned by Major League Soccer commissioner Don Garber there needs to be signs of progress with his Miami-based franchise.
Former England captain Beckham, 39, had two plans for a 25,000-seat stadium in central Miami rejected last summer.
MLS will consider a report from the league's expansion committee this weekend and Garber indicated some decisions would be made early in 2015.
"This can't go on forever," Garber said of the delays with Beckham's franchise.
Garber says the league is not performing as hoped financially and its franchises are combining to lose more than £64m ($100 million) annually.
He added that a Miami-based side remains an objective for MLS if the ground issue can be solved.
"The Beckham group continues to work to try and find a stadium solution that they believe will put them in a position to succeed," Garber said.
The league will grow to 20 teams in 2015 with the addition of New York City FC and Orlando City FC followed by Atlanta and a second LA-based team in 2017.
Talks have also been held with groups in Minnesota, Sacramento and Las Vegas.
Meanwhile, MLS will not get involved in the decision over whether midfielder Frank Lampard's loan deal at Manchester City will be extended into next year.
A deal beyond February would impinge the 2015 MLS season but Garber said it was entirely a matter for NYCFC to resolve.
He added: "All player personnel decisions are made by the club. I have great confidence in the management in New York and the ownership and their representatives."
|MLS commentator Richard Fleming|
|"Time is running out for David Beckham. The league is aiming for 24 teams and others are queuing up, so Miami and the former England captain had better get a move on.|
|"It's all gone quiet at the moment, though. MLS want Beckham on board, but building a new stadium in an exclusive area doesn't come cheap."|