When Sam Madison played for the Giants he would regularly advise younger cornerbacks and in 2007 one of those younger corners was a 23-year old rookie named Aaron Ross.

“When he came into the league he was an older guy so I’m thinking he would be mature’’ Madison told The Post “but when you’re in college having everything at your fingertips you don’t really understand it until you get in the real world where everybody is scratching and pulling for himself.’’

Madison in the 11th season of a 12-year career and with diminishing physical skills turned into a leader for the 2007 Super Bowl team. Ross became a starter for that championship defense and wouldn’t have been able to handle the load without Madison’s help.

“That’s like the big brother’’ Ross said. “My rookie year when I came in Sam took me under his wing and kind of showed me the ropes taught me what to do taught me how to take care of my body how to study how to take notes.’’

Six years later Madison is back with the Giants albeit temporarily. He is spending training camp working with the defensive backs as part of the Bill Walsh minority internship coaching program. A popular figure during his three years with the Giants (after making the Pro Bowl four times in his nine seasons with the Dolphins) Madison has reconnected with some of his former teammates including Ross.

“He seems happy he’s comfortable with his role’’ Madison said. “He’s matured.’’

Ross now 30 is no longer a hotshot former first-round draft pick thrust immediately into a starting role. His five-year run in New York appeared at an end following the 2011 season when he hit free agency. The Giants didn’t make much of an attempt to keep him — even though he started 15 games for a Super Bowl-winning defense — and he signed a three-year $9.75 million contract with the Jaguars. Upon leaving Ross said all the right things and proceeded to play in 14 games (nine starts) for the moribund Jaguars who went 2-14.

Ross saw what life was like on the other side.

“To come from an organization like this it’s first class’’ Ross said. “You have really high expectations for everything. And the players the type of players that they bring here everything is like you’re looking to win a Super Bowl every year. I think you get spoiled by that.

“Every team talks about winning a Super Bowl. But being here for five years it’s something that is imbedded in you. In Jacksonville they talked about it everybody wanted to win the Super Bowl it was just something that we knew we didn’t have a chance. It’s different. It’s a little different.’’

A player rarely gets a second chance with his first team but the Giants welcomed Ross back after the Jaguars waived him. Ross got a one-year deal hasn’t stopped smiling and has looked as if he has a new lease on life. Ross is slotted in as the No. 3 cornerback filling the difficult and critical nickel back spot. He has been one of the best defensive players in camp and if he holds up the Giants will have a solid player working with starters Corey Webster and Prince Amukamara.