Melvin Gordon's holdout for a new contract from the Los Angeles Chargers is expected to be prolonged and could last into the season, according to sources.

The two sides have exchanged figures in recent days without significant progress.

Gordon is in the final year of a rookie contract that is scheduled to pay him $5.6 million. The running back told the Chargers through his representation that if he does not receive a new deal, he'll sit out and demand a trade.