When Giants head coach Brian Daboll on Wednesday said, “I’ve been on him, pretty early on,’’ there was no contradiction coming from rookie tight end Daniel Bellinger.

“I just think he’s hard on all young players, not just myself, all the rookies,’’ Bellinger told The Post on Wednesday after practice. “I just know he has been on me to keep pushing and keep getting better. He’s been on us a lot.’’

Whatever Daboll and tight ends coach Andy Bischoff and anyone else involved with the position are doing, it is working. The Giants are 4-1, and Bellinger through five games is one of the NFL’s most productive rookies at his position.

Daboll spent four years (2013-2016) in New England coaching tight ends — his prize pupil was Rob Gronkowski — and he admits he is not easy on players at that position.

Again, no argument from Bellinger.

“He does know a lot about the tight end position, you can see that with how he gets on the tight ends specifically,’’ he said.

Bellinger’s numbers are not overwhelming — 10 receptions for 101 yards — but, then again, the entire passing operation is far below where it needs to be. The Giants are 31st in the league in net passing yards per game and 32nd — dead last — in net passing yards per play.

No tight end selected ahead of Bellinger — a fourth-round pick out of San Diego State — has more receptions. Trey McBride (second round, Cardinals), has only three catches for 24 yards. Jelani Woods (third round, Colts) has three catches for 46 yards. Greg Dulcich (third round, Broncos) is on injured reserve. Jeremy Ruckert (third round, Jets) does not have an NFL catch. Cade Otton (fourth round, Buccaneers) has 10 catches for 76 yards.

Ever since Kevin Boss (fifth round, 2007), the Giants have been searching for a suitable replacement, with the most notable move the selection of Evan Engram in the first round (23rd overall) in 2017.

Before Engram, the Giants tried Travis Beckum (third round) in 2009, Adrien Robinson (fourth round) in 2012 and Jerell Adams (sixth round) in 2016. All were disappointments.

It looked as if the Giants were onto something with Engram when he caught 64 passes for 722 yards and six touchdowns as a rookie. As it turned out, those were all career highs, and his five years with the Giants were marked by plays not made for an offense and franchise in disarray.

Bellinger arrived with little fanfare, understandably, considering in four years in college he never really established himself as a high-volume pass catcher. In 31 games, he had 68 receptions and five touchdowns and his best season was in 2021, when as a senior he had 31 receptions for 357 yards and two touchdowns.

Daboll credited first-year assistant general manager Brandon Brown and Tim McDonnell, the director of player personnel, for scouting Bellinger and then becoming “huge proponents for him during the draft process.’’ Both personnel executives wrote glowing evaluations.

“They stood on a table for him,’’ Daboll said of Brown and McDonnell’s fervor for Bellinger.

The Giants signed two veteran tight ends, Ricky Seals-Jones and Jordan Akins, but neither made much of an impression. Seals-Jones went to injured reserve and Akins was cut.

Since Day 1 in the spring, Bellinger looked as if he belonged. Still, he had to earn the trust of Daboll, the offensive staff and quarterback Daniel Jones. In Week 2 against the Panthers, Bellinger rose above the design of the actual play with his first NFL touchdown reception. He hauled in a short pass from Jones, turned the corner and used a headfirst dive to the pylon, putting on display his speed and athletic ability.

“I think he’s got good feel,’’ Jones said. “He’s got good instincts. He’s got a knack for making the right play, being in the right spot. He’s been consistent in that for us. I think he’s done a great job.’’

Against the Packers in London, Bellinger’s best move might have been what he did not do. Offensive coordinator Mike Kafka called for a play called “Bellinger Pass,’’ and the double reverse — Jones to Saquon Barkley to Bellinger — allowed Bellinger the option to pass the ball, with Jones and tight end Tanner Hudson the targets. Jones was not open. Hudson was open but not wide open. Bellinger decided to tuck it and ran in from the 2-yard line for his first career rushing touchdown.

“He’s come a long way,’’ Daboll said. “He’ll be the first to tell you he’s got to keep improving. I’d say he’s a tough-minded individual. Tight end is a difficult position to go from college to the NFL. We ask him to do quite a bit, been very happy how he’s approached things.’’