Restricted free-agent center Brook Lopez is progressing toward an agreement for a maximum contract with the Brooklyn Nets, league sources told Yahoo! Sports.

Nets president Billy King and Lopez’s agent, Arn Tellem, are finalizing the length of the deal – four years for $58 million, or five years for $78 million – and ironing out protections on the back end to account for a right foot that Lopez broke twice in the past year, sources said.

As close as the Nets and Lopez are on a deal, several sources wouldn’t rule out the possibility of Lopez still signing an offer sheet with another team for the full four-year, $58 million maximum contract if the final details are unable to be worked out. The Charlotte Bobcats have shown the most interest in signing Lopez to a max sheet, sources said. The Nets would undoubtedly match, but signing the offer sheet would be a way for Lopez to avoid any partial guarantees based on games that the Nets might want in his deal.

via Adrian Wojnarowski of Yahoo! Sports