Commissioner Roger Goodell says that the NFL has not "identified a viable solution" in building a football stadium for the Raiders in Oakland.
In a letter to Oakland Mayor Libby Schaaf, Goodell stated that he saw "significant uncertainties" surrounding the stadium proposal.
Schaff recently offered a plan to build a $1.3 billion stadium on land where the Oakland Coliseum is located. She also said that Fortress Management Group would chip in $600 million to fund the project.
But Goodell said in his letter that the proposal lacked specifics. He claimed it wasn't clear how and when the stadium would be built, nor was it certain how Fortress or other parties would be involved. Goodell was also concerned about what would happen to the Oakland A's, who currently share the Coliseum with the Raiders.
At the end of his letter, Goodell mentioned that NFL owners would consider the Raiders' application to move to Las Vegas during their next meeting in Phoenix.