The Giants got their most extensive look this week at Bradley Chubb, who will be on the board for them the night of April 26 when it comes time for the No. 2 overall pick in the NFL draft. The top defensive player available is unquestionably in the running for the Giants, even though this defensive-end prospect would actually be called an outside linebacker in new coordinator James Bettcher’s system.

“I think each and every down we might look different on defense,” Bettcher said. “I can’t tell you today who we’re going to be on defense and really what we’re going to look like until we get through training camp, until we get into meetings, until we actually get on the field.”

If the Giants decide to bypass a quarterback and opt for an impact player on defense, rather than running back Saquon Barkley or guard Quenton Nelson, be assured Chubb will be on the field each and every down for Bettcher.

As one of the 30 pre-draft visits they are allowed, the Giants played host Wednesday and Thursday to Chubb, the North Carolina State product who can instantly upgrade any defense.

Typically, prospects arrive in the late afternoon and go to dinner with the head coach, appropriate coordinator and position coach. The player spends the next day at the team facility, meeting with coaches, talking football, getting a tour, speaking with the general manager and any other pertinent team officials. The visit usually ends in the late afternoon, lasting about 24 hours in duration.

The Giants are in the process of putting together their draft board and will not have a single character issue or off-the-field concern with Chubb, who is as clean a prospect as there is in this draft. As far as on the field, his work is extensive (four years, 40 games) and productive (20 sacks, 44 tackles for loss the past two seasons).

Chubb can fit as a classic defensive end on a four-man line and also as an outside linebacker in a defense featuring three down linemen and four linebackers. Chubb has experience in college standing up as an edge rusher, something he would be asked to do with the Giants.

In fact, Chubb would be able to play four different spots on Bettcher’s defense, according to a source with knowledge of the Giants’ draft thinking. Chubb could line up on either side at defensive end and either side at outside linebacker.

“He plays four spots for you,’’ the source told The Post. “He can play either defensive end, he can play with his hand on the ground, he’s gonna play the outside linebacker spot, on either side, just like Olivier Vernon’s gonna do. In the base scheme, he’s gonna be a stand-up outside linebacker. It’s not like the old 3-4, two-gap sit-and-read defense. This is up-the-field, penetration, cause-mayhem type.”

Bettcher mentioned players (Chandler Jones, Markus Golden, Dwight Freeney and John Abraham) under his tutelage with the Colts and Cardinals who excelled in his system — players viewed as linebackers or defensive ends who morphed into difference-makers.

“I had a chance to learn from those players as well, and hanging your hat on scheme, you don’t win that way,’’ Bettcher said. “You hang your hat on the things that mean the most and those things are being relentless, playing hard, playing smart and playing physical in the game.”

Eli Manning on Thursday held his annual workout at Duke University — where his college coach at Ole Miss, David Cutcliffe, is the head coach. Manning was joined by teammates Sterling Shepard, Brandon Marshall, Evan Engram, Roger Lewis, Rhett Ellison and Wayne Gallman.