On the day when Davis Webb was finally given his first first-team practice reps, Landon Collins offered his advice for the next Giants general manager, on the day favorite Dave Gettleman interviewed for the job.

Informed the next Giants GM currently has the second pick in the 2018 NFL Draft with a chance to draft a franchise quarterback — Josh Rosen or Sam Darnold if he comes out — Collins told The Post, “Don’t draft him. Don’t do it. Davis is gonna be really good in the league when it’s his time, I promise you.”

Dominique Rodgers-Cromartie seconds that emotion. Asked what he’s noticed about Webb, DRC said: “A young Eli. I used to laugh at him, ‘Why is the man mimicking Eli during a practice when Eli takes a step, you can see him behind him doing the same motion he is. What is wrong with this dude?’ It finally hit me that he’s just trying to do everything that he’s doing, so he’s definitely learning, willing to learn and he’s doing the right things, I think.”

Asked if he thinks the Giants need to draft a quarterback with the second pick, Rodgers-Cromartie told The Post: “Nah, nah. I think he’s the guy that has the arm, and he’s studied under Eli, so I think he still has an opportunity to be that guy.”

So your opinion would be Eli starts next year and Webb is the backup.

“Right.”

And forget about Sam Darnold or Josh Rosen.

“Yes, sir.”

Why wouldn’t you want the second pick in the draft to be a quarterback?

“I’ve seen him drop it in the bucket,” Rodgers-Cromartie said, “I’ve seen the things that he’s done.”

Then why hasn’t he gotten a chance to play?

“It’s still Eli’s team. It’s still Eli’s game to lose.”

But 2-12 …

“I can’t make that decision,” he said. “I mean, you want to see him get out there and do something, but that’s for them [decision-makers].”

Steve Spagnuolo again declined to say whether Webb might be active for the first time Sunday in Arizona.

“We have eight reps in practice where we go Giants defense versus Giants offense. Normally Eli would take all of those, but Davis took six of the eight today, so we’re amping him up a little bit,” Spagnuolo said.

Webb was told Tuesday that Operation CobWebb Removal would begin.

“It was a cool experience, and I got better from it today,” Webb said.

How’d you do?

“I think I did good, it’s my first time getting reps in a little bit in a team setting, and I think I did a pretty good job,” he said.

Manning agreed. “Thought he made some good calls, and got us in some better plays, some good checks, and ran the offense well,” he said. “Late in the year, you don’t mind getting a few reps off and let him get some reps, it’s all good.”

A road game with zero playoff implications against the 6-8 Cardinals would have been the perfect opportunity to play Webb. Why are the Giants reticent about throwing him to these wolves?

“He just hasn’t had many reps running this offense, and even in training camp, [we] had four quarterbacks, he was the fourth one,” Manning said. “He’s played some, but he’s a smart kid, and he can figure it out.”

Is John Mara convinced that Webb is the heir apparent and doesn’t need to see him get his feet wet? It sounds as if he has scrapped the plan to see Webb for whatever reason. Even if it should come at the expense of the second pick of the draft.

“I’m focused on winning the football game, and to me, winning the football game’s with Eli Manning,” Spagnuolo said.

Webb sounded like a kid on Christmas morning talking about his reps and couldn’t wait to watch them on film.

“It’s totally different, though, you’re not getting hit,” he said. “I took another huge step. I was very excited about today, now I’m more excited about getting there and watching the film of it.”

Webb dueled with Darnold last October when USC beat Cal, 45-24. Webb, playing without injured wide receiver Chad Hansen and his slot receiver, completed 34-of-54 passes for 333 yards with two touchdowns and one interception. Darnold was 18-of-25 for 231 yards with five touchdowns and one interception.

“I know Sam. I was one of his counselors at the Elite 11 when he was a senior in high school, I was a sophomore in college,” Webb told The Post. “I was like the youngest counselor to go back at that time. He was in my group, he was a heck of a quarterback, he’s a heck of a person. I know Sam well, he’s a really good player.”

If he comes out, the next Giants GM could be staring at him with the second pick.

“The only thing I’m worried about is the last two weeks of the season, especially this week, help my teammates enjoy success,” Webb said. “I don’t like to talk about any of that, I don’t like to start up controversy or anything. Only thing I’m worried about is helping Eli succeed this week.”

If it were up to two of his prominent teammates, he’ll be helping Manning succeed next season.