Deonte Banks said “it felt amazing’’ to make his NFL debut Friday night, and he wondered what was going on when he was asked about getting beat in the first quarter by Lions wide receiver Jameson Williams.

“I played the deep ball real good,’’ the 22-year-old cornerback told The Post after the Giants were defeated 21-16 in their preseason opener in Detroit. “He didn’t have a step on me.’’

It looked as if Williams did indeed have a step on Banks, the rookie first-round pick, on the Lions’ second series of the first quarter.

Nate Sudfeld’s deep ball was on the money, but it hit off Williams’ hands for what at first glance looked like a drop.

Upon further inspection, Banks recovered and was able to aggressively use his left arm to rip down on Williams’ left arm from behind, making sure there would be no catch on the play.

“I thought I played good,’’ Banks said. “I feel good about myself.’’

Banks and another rookie corner, Tre Hawkins, played 37 snaps on defense in their unofficial NFL debuts.

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Tyrod Taylor started, but played only eight snaps at quarterback before he was replaced by rookie Tommy DeVito, who played the final 51 snaps on offense.

Next up is preseason meeting Friday night with the Panthers at MetLife Stadium.

Asked about Daniel Jones and that game, head coach Brian Daboll on Saturday said, “I’d anticipate him playing.’’

Isaiah Hodgins, who could be in line to be one of the starting wide receivers, played 18 snaps, including several late in the game with the third-team offense. He had one catch for 13 yards.

“I thought it was good for him,’’ Daboll said. “He was a practice squad player for a while there and came on with us late, so I thought it was good to get him some reps early on with Tyrod.’’

The only reception of the night for TE Tommy Sweeney, and the only scoring pass of the night for DeVito, turned into a momentous happening for Don Bosco Prep in Ramsey, N.J. Sweeney was a senior at the school when DeVito was a freshman, making their 14-yard TD connection something to remember.

“That’s a pretty incredible thing,” Sweeney said. “I don’t know that that’s happened many times in the history of the NFL, so that’s pretty cool. A lot of connections up in Ramsey. It’s nice to get one out here in Detroit.”

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The Giants allowed five sacks, including three by Julian Okwara and one by his older brother, Romeo, who was with the Giants in 2016 and 2017 after he went undrafted out of Notre Dame.

Romeo, 28, went on to get 7.5 sacks for the Lions in 2018 and 10 sacks in 2020.

He and Julian, 25 — a third-round pick in 2020 — were on the field late in the game with the third-team defense, which is usually not a good sign for veteran players.

“It was nice to see the two brothers go in there and crush the can,’’ Lions head coach Dan Campbell said.