The Raiders continue to pursue the possibility of playing in San Francisco next season, even as they remain officially homeless for the 2019 campaign.

Negotiations are continuing for the Raiders to play their 2019 home games at Oracle Park, home of the Giants, a source said Sunday night.

NBC Bay Area reported Sunday evening that the Raiders had reached a deal with the Giants to play next season at Oracle Park. The NFL would have to approve a deal, however, and the 49ers would have to waive their territorial rights in San Francisco. That has not happened, according to sources familiar with the situation.

Article 4.2(A)(1) of the NFL’s bylaws states that the 49ers and Raiders have “exclusive right” to play in their cities, and that “neither the San Francisco nor the Oakland club shall have any right to play professional football in the city of the other without the consent of the other club.”

In December, the Raiders withdrew from a tentative agreement to play one more season at the Oakland Coliseum before moving to Las Vegas in 2020. That decision came a day after the City of Oakland filed a federal lawsuit against the team and the NFL over the Raiders’ impending relocation, calling the move “illegal” and demanding hundreds of millions of dollars in compensation.

There have been indications the team will remain in the Bay Area for next season.

NFL Commissioner Roger Goodell told reporters in Atlanta last week that: “I think the hope of (Raiders owner Mark Davis) is to continue to be in the Bay Area with Raider fans.” Goodell said he expected a resolution to the Raiders’ stadium situation “soon,” adding the NFL needs an answer for scheduling purposes.

CBS Sports reported Sunday that the league recently conducted a site survey of Oracle Park to determine whether it could host the Raiders for a season. Other possible solutions include the Raiders sharing Levi’s Stadium with the 49ers for a season or returning to the Coliseum.

Oracle Park likely would seat between 38,000 and 40,000 fans for football games. The venue has hosted football: The XFL’s San Francisco Demons played there in 2001, Cal played home games there in 2011 and the stadium hosted a college bowl game from 2002 through ’13.

The Raiders need a home for seven regular-season games. They will play one “home” game in London, against the Chicago Bears.

Chronicle staff writers Eric Branch and John Shea contributed

to this report.

Matt Kawahara is a San Francisco Chronicle staff writer. Email: mkawahara@sfchronicle.com Twitter: @MatthewKawahara