No chance. Zero.

That is Dave Gettleman’s estimation when it comes to the Giants missing out on a stud defensive player with the No. 6 pick Thursday night in the first round of the NFL draft.

There are enough of them ripe for the picking this year, that no matter how the top five selections go, a defensive player capable of stepping in and making an immediate impact for the Giants will be on the board, awaiting the stamp of approval from the general manager.

The lousy 5-11 record in 2018 gave this lofty pick to the Giants and they do not need to use it to find their next franchise quarterback. That is because the prize in the gift box from Cleveland in exchange for trading star receiver Odell Beckham Jr. to the Browns is the No. 17 overall pick in this draft. At 17, the Giants sit on an advantageous launching pad, with the vantage point to move up a few picks to get the successor to Eli Manning — after attending to what far and away is their most pressing need: Landing big-time help for a shabby defense.

The deficiencies are glaring at edge rusher, cornerback, coverage ability at linebacker and a difference-maker on the interior of defensive coordinator James Bettcher’s three-man line.

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There is some late buzz/speculation that Josh Allen of Kentucky could fall to the Giants at No. 6, a scenario that feels farfetched, given the NFL’s adoration with pass rushers and Allen’s 17 sacks last season in the Southeast Conference. If Allen is available, figure Gettleman will invent some sort of transportation portal and beam himself directly to Nashville, site of the draft, to triumphantly make the selection in person.

Barring that sort of stunner, the Giants realistically should be able to choose from among LSU inside linebacker Devin White, defensive ends Clelin Ferrell of Clemson, Rashan Gary of Michigan and Montez Sweat of Mississippi State or defensive tackle Christian Wilkins of Clemson, or, if he drops, Ed Oliver of Houston.

Ferrell at 6-foot-5 and 265 pounds has been compared by some scouts to Chandler Jones. Ferrell had 11.5 sacks and 20 tackles for loss, helping Clemson win a second national championship in three years. Gary looks the part of an NFL star and some of his measurable athletic qualities — he ran 4.67 at 283 pounds — makes him a dream in many ways. What is a bit of a nightmare is his paltry production — he had 9.5 sacks in three years at Michigan and does not have a single deflected pass on his college résumé. Gary’s upside might have made him a slam-dunk pick for Jerry Reese, the former general manager, but Gettleman prefers a blend of talent and productivity.

Sweat wowed all who witnessed him run 4.41 at the combine, setting a record for a defensive lineman. He had 12 sacks in 2018 and devoured the offensive linemen asked to block him during the week of Senior Bowl practices. Sweat, though, had issues at Michigan State and landed in junior college before surfacing at Mississippi State. Sweat also was diagnosed with a preexisting heart condition that is considered low-risk, a medical wrinkle that will drop his draft stock in the eyes of some teams.

Oliver is this year’s iteration of Aaron Donald, in theory, and likely will be gone by No. 6. Wilkins at 6-3 and 300 pounds is one of the undersized interior linemen making a comeback in the NFL. With the Giants, there would be some duplication with B.J. Hill, a third-round pick last year who started 12 games as a rookie. Wilkins is as clean a prospect as there is, never missing a game in four years at Clemson and attaining Academic All-America status.

The real wild card at No. 6 for the Giants is White, a 6-foot, 240-pound inside linebacker — a position many NFL personnel evaluators do not value highly in a draft. White was voted a permanent team captain in his final two years at LSU and has a bold personality that makes him a natural leader. He could become the face of the defense, a fierce competitor to rival Saquon Barkley as the face of the Giants offense.

“Love him,’’ Dan Shonka, general manager and national scout for Ourlads’ scouting service, told The Post. “That wouldn’t be too high to take Devin White. You got to have that multiple-purpose linebacker, that guy who can play in space. He can run, he can cover, he can play the run, he can play the pass, he can go sideline to sideline, he never comes off the field. You walk him out in the slot, can play man-to-man. That would be big-time for New York.’’