First-round pick Justin Pugh out of Syracuse is the Giants’ future at right tackle. But the present remains 11-year veteran David Diehl.

“Right tackle is David Diehl with Justin Pugh working at right tackle” offensive line coach Pat Flaherty said definitively yesterday.

Diehl the longest-tenured Giant — who is coming off right knee surgery after last season — acknowledged the situation. Old versus new veteran versus rookie. But Diehl at 305 pounds after a new creative diet is determined to keep his starting job. The future can wait.

“It’s all about competing and pushing yourself to the limit” Diehl said. “Justin Pugh’s a great pick great guy in the locker room. I’m not going to be around forever. I’m a guy who’s been able to play different positions on the run. Justin’s that guy. ... He’s the future of our offensive line. He’s the guy who can play center guard tackle.”

Just don’t pencil the 6-foot-4 301-pound Pugh in for the first team right tackle job just yet.

“David Diehl is a highly motivated person” coach Tom Coughlin said. “And competition always brings out the best.”

So Diehl welcomes the challenge.

“I’m not giving anything away. I’m going to earn my position just like anybody” Diehl said. “Bringing in somebody like that brings great competition and it not only makes him a better football player but it’s making me a better football player which in turns makes our team better.”

Pugh working with the second team has impressed with his versatility (he played left tackle in college and can play both guard spots).