When Chip Kelly decided on Michael Vick as his starting quarterback in September, he had the backing of the man who hired him. Jeffrey Lurie, the Eagles’ longtime chairman, is still supportive of his first-year coach’s decision to go ahead with the 33-year-old Vick, despite the quarterback’s age, track record of injuries and recent struggles. But he also believes the team’s top priority going forward is finding the next young franchise quarterback to pair with Kelly, the way Andy Reid and Donovan McNabb came together during the most successful decade in franchise history. Nearly every Super Bowl-winning franchise was built around an elite, cornerstone quarterback. “We need someone to step up, whether it’s an existing young quarterback or somebody we go out and acquire,” Lurie said in an exclusive interview with CSNPhilly.com. “We know -- this is no secret -- quarterback is the [ultimate] position and the most important difference-maker.” Lurie views Sunday’s game against Oakland as another significant measurement of second-year pro Nick Foles’ ability to embrace that mantle. Foles will start against the Raiders at O.co Coliseum, backed up by rookie Matt Barkley with Vick out indefinitely after aggravating the hamstring injury that already sidelined him for two games. “We want to have very healthy, high ability at that position, with excellent leadership and a lot of smarts and a lot of moxie. Someone that really can take that position and run with it,” Lurie said. “And so Nick is going to have a great opportunity to showcase what he’s done. He’s had some outstanding games and he’s had one poor game. “Time will tell. I think it’s really wide open for those that are on the team and it’s wide open for what our strategy might be if we don’t have it. But it’s a No. 1 priority. We’ve got to solidify that position in a really good way.”