Rookie point guard Jerian Grant did not play in the first and, thus far, only game of Knicks interim coach Kurt Rambis’ stint.

Rambis explained why he sat Grant against the Wizards, indicating there’s a chance Grant’s minutes could continue to be limited because of how much his lack of experience has hindered him.

The Knicks’ point-guard situation is shaky, with Jose Calderon’s defensive shortcomings. Help is not on the way via trade. (The club still has an open roster spot, and Rambis made indications the Knicks could look to their D-League team, where point guards Jimmer Fredette and Travis Trice are employed.)

Former Knicks coach Derek Fisher was rarely clear when assessing his players to the media, so Rambis’ long-winded treatise on Grant’s flaws was refreshing. Grant has not played in four games, and in another game, he was in for just six seconds.

“He’s just a young player,’’ Rambis said. “He’s growing, maturing, developing. There’s a lot to learn. The point-guard position in the NBA is the most difficult position to learn.

“Managing your teammates, you have to know every sequence, where everybody is supposed to be, follow instructions of the coach, who’s hot, who’s not, who needs a shot, what sequence to run. All those decisions have to be made in a split second. He just needs some maturing and growing. The last couple of practices, he’s turned his jets back on. That’s what we really need him to do.’’

That Grant has looked rejuvenated in scrimmages the past two days out of the All-Star break could be a sign Rambis will give him a shot Friday against the Nets in Brooklyn as the Knicks return from their hiatus.

“His aggressiveness and ability to attack the basket, those are things we like in him,’’ Rambis said. “He’s got good length to play defense and speed to play pressure defense. We got to encourage him to do that more. But you need experience. … You can watch tape all you want. You need multiple seasons.’’

Calderon has plenty of seasons under his belt and the fans still would have preferred him to be shipped out Thursday. The Spanish point guard seemed pained by his lack of respect from Knicks fans.

“It doesn’t matter how I play,’’ Calderon said. “When you get off on the wrong foot and expect something because they don’t know you as a player and they’re expecting something else. It’s tough to change those minds.’’

Calderon, shopped at the trade deadline, then added, “It’s not fun when you’re trying to win for the Knicks and people want you out of the Knicks.’’

It’s unclear if Calderon was referring to the fans or management.

Rambis on signing a player for the open roster spot: “There’s players we’ve kept our eye on we might bring in. We’re looking at guys who can possibly come in and help us out or take a better look at in practice and see how they fit in with everybody else, whether they play or not.’’