Tom Coughlin blames himself for the Giants losses.

He’s not alone.

That’s why these next four games could wind up being critical to his future with the Giants. After three seasons without making the playoffs, if the Giants can’t get there this season — and through this weak division — then there is a mounting feeling that a change may be needed for the franchise.

Coughlin’s response to that?

“I don’t pay any attention to it,” he said when the subject of his job security was broached Monday.

That doesn’t mean it does not exist. It was a year ago that the Giants lost to the Jaguars and John Mara later said he left that game feeling as if he wanted to “fire everybody.”

As Mara silently walked through the Giants’ locker room Sunday evening, he had a similar look of disgust on his face. Whether he acts on that impulse a month from now remains to be seen, but Coughlin insists that he is not affected by the speculation or even the reality of the possibility.

“I’m trying to stay focused for the benefit of my team and my coaches and everybody else,” he said.

Coughlin admitted it is “pretty frustrating” that each time he makes a critical decision in a game, it is sabotaged by a lack of execution. That was again the case Sunday when Coughlin decided to go for a touchdown and a 17-point lead rather than kick a field goal to go up by 13 midway through the fourth quarter. Eli Manning threw an interception, the Giants came away without scoring and up by 10, and the Jets scored the game’s final 13 points.

It was the fifth time this season the Giants have lost a game in which they led in the final two minutes of regulation. Those losses have come by a combined 12 points.

“The majority of what we’ve done is to try to put ourselves in position where that last drive is not going to put us in the situation we’ve been in four or five times. Obviously, that hasn’t happened. We’ve tried for touchdowns instead of field goals, and it hasn’t happened.”

Coughlin defended his decisions.

“Quite frankly, you can all disagree, but we’re trying to win games the best way we can,” he said. “To be honest with you, nobody knows my team better than I know my team. So when you sit in judgment of what goes on, it’s all been thought out whether you like it or not, whether it’s right or wrong.”

He also said he has confidence in the ability of his defense to make a key stop late in a game, although he admitted he has yet to see it happen.

So what is a head coach to do when every button he presses seems to open a trap door beneath him?

“Keep coaching,” he said. “Keep working. Keep fighting. Keep planning. Keep deciding. Keep making decisions based on what we have and be aggressive. Don’t sit back because the world thinks it’s not getting done.”

The Giants could still win the division, even if they just split their final four games and finish 7-9 (two seven-win teams have made the playoffs since 2010). Coughlin has been driving that fact home to the despondent players.

“We’re all sick of losing,” he said. “We have to find a way to win a game and change this negativity . . . Get our momentum going in the right direction.”

Time is running out on the Giants’ season, and, quite possibly, Coughlin’s tenure.

“We’ll win,” he said, “when we deserve to win.”

And if not, then they probably deserve what they get from that, too.