OAKLAND, Calif. Giants ownership, possibly anticipating further ugliness at home with the way this season has gone down the drain, exacerbated by the way the end of Eli Mannings consecutive-game starting streak went down, could be prompted to fire Ben McAdoo after Sundays game against the Raiders.

If ownership is already convinced McAdoo is going to be dismissed after the season, there might be no reason to wait until Jan. 1, especially considering three of the last four games are at MetLife Stadium, and these final home games could spark some of the ugliest moments in franchise history.

An ESPN report states McAdoo could be fired within 24 hours of the game against the Raiders.

If McAdoo is sent packing, defensive coordinator Steve Spagnuolo is a logical choice to fill in at interim coach, as he was the head coach of the Rams for three seasons.

Fans are irate at the way McAdoo ended Mannings 210-game starting streak, even though co-owner John Mara is completely on board with getting a look at Geno Smith the starter Sunday against the Raiders and rookie Davis Webb at quarterback. How irate? Protests are scheduled for the Dec. 10 game against the Cowboys.

Basically what were trying to do is a peaceful protest, a little solidarity for Eli, Matt Meyer, a longtime Giants fan, told The Post. Were trying to encourage our friends on Giants Facebook groups and message boards to not go in, not re-sell our tickets. Let everyone see this.

The plan is to tailgate, as usual, at MetLife Stadium, and remain in the parking lots during the game to show the displeasure of the fans in the form of empty seats. Money is also being raised to fly a plane with a message over the stadium, similar to what transpired in 1978, when a banner reading 15 Years Of Lousy Football Weve Had Enough! flew over the stadium and helped usher in regime change.

Mara and Steve Tisch issued a joint statement Nov. 13 after the Giants dropped to 1-8 following a 31-21 loss to the previously winless 49ers indicating no moves would take place until after the season: It is our responsibility to determine the reasons for our poor performance and at the end of the year, we will evaluate the 2017 season in its entirety and make a determination on how we move forward.

The situation within and around the Giants has grown worse since then. Mara wanted McAdoo to come up with a plan to ease Manning out for the remainder of the season in order to better assess Smith and Webb, with the Giants about to be sitting on a top-3 pick in the 2018 draft and in need of more information about what they currently have on the roster at quarterback. McAdoo told Manning he would continue to start but would be taken out of the game at halftime, initially for Smith. Manning slept on that plan and informed McAdoo we would rather not play at all than keep his streak alive in such a manner.

Shockingly, the Giants were completely taken aback by this, anticipating Manning would go along with it. The blowback has been intense and furious, and Mara admitted McAdoo could have handled this differently. Mara did not offer a logical alternative plan, though. According to ESPN, ownership is concerned McAdoos lack of communication skills is at the root of many problems that hit the team this season. Asked to clarify McAdoos job security for the remainder of the season, Mara on Wednesday said, There are no guarantees in life.

The last time the Giants fired a coach during the season was 1976, when they dismissed Bill Arnsparger after an 0-7 start.