When you are the man to make the call — yea or nay — on the fate of the head coach, there are two evaluations more important than anything else.

“To me, when you look at head coach, is he getting the most out of the talent, No. 1,’’ Charley Casserly told The Post. “No. 2, are they listening to him?’’

Casserly, former general manager of the Redskins and Texans and currently an NFL Network analyst, fixed his trained eyes on Tom Coughlin and the Giants and came away with this:

“To me, they were playing their butts off up until last Sunday night,’’ Casserly said, referring to the rout in Minnesota. “They certainly were listening to him up until last Sunday night, and I think he’s doing the best he can with the talent.”

That sounds darn close to a vote of confidence for Coughlin staying for a 13th season.

“From the outside, the players are playing hard, so if I’m looking at that and this guy’s still got the energy, then you don’t replace him,’’ Casserly said. “You have to be inside the building to understand the dynamics.

“There are some places you can say, yeah, you need to change, it’s obvious. It’s not obvious with the Giants.”

Coughlin is likely coaching his final game Sunday, when the Giants face the Eagles at MetLife Stadium. It will be a dreary send-off for a pair of 6-9 teams, one having already fired its head coach, Chip Kelly, another expected to part ways with its after two Super Bowl triumphs but four consecutive seasons missing out on the playoffs.

Casserly is in line with those who view the Giants as a flawed team with a roster depleted by injuries and starved of depth and talent because of bad drafts. Before reaching a decision, he would want to know if Coughlin, 69, is up for another year of this.

“Hey, age catches up with everybody, in many areas, mentally and physically,’’ Casserly said. “You got to see where he is, does he still have the energy to do this? That’s crucial. That’s hard to judge because you’re judging next year, you’re not judging today, so that’s a guess.’’

There is also the question of who arrives as the replacement.

“There isn’t exactly Bill Parcells sitting there ready to walk in,’’ Casserly said. “It’s not, you can sit there and go to the grocery store and buy one. There’s a gamble in whoever you bring in, and I think the Giants are well aware of that because Coughlin’s an exceptional coach, and they know that. So you’re going to have a little bit of a gamble going in if you make a change, you’re going to be in the tournament like everybody else. That doesn’t mean you can’t get a good coach, but it’s not surefire.

“I think if [Coughlin] was 59 it would be less obvious. I don’t think you’d have some of this discussion, you’d have some of it but not as much.”

All those close losses? Casserly pins the blame on two inherent failures: an inability to find a fourth-quarter pass rush on defense and no ability to close out games with a running game on offense. Sure, Casserly did not like the miscommunications at the end of the season opener in Dallas and did not agree with Coughlin’s decision to pass up a field goal to extend the lead to 13 points against the Jets. But the far greater issue is the roster put together by general manager Jerry Reese.

“Clearly what’s happened is they’ve had some bad drafts a couple of years ago, they’ve drafted a little better the last two years,’’ Casserly said. “I think they got to take a good, hard look at what they’re doing in scouting, why they have struggled at certain times and figure out: Is there something they need to evaluate there and change there? I know I had to go through that myself and change things internally. We didn’t fire anybody, we changed some things internally in philosophy on how we were doing it and it was fine, we got better.’’

Whichever direction the Giants go with Coughlin, Casserly said, “I won’t be surprised either way.’’

As for Reese, Casserly was not touching that one.

“I wouldn’t comment on Jerry one way or another,’’ he said.