The Glasgow Rangers manager worked alongside the Northern Irishman at Watford.
Rangers boss Mark Warburton has offered Brendan Rodgers the same piece of advice that he received when he took over at Ibrox as the Northern Irishman appears to be closing in on the Celtic job, the Daily Record reports.
The Record claims that the former Liverpool boss is now the clear favourite to replace Ronny Deila at Parkhead, which would mean that he could be coming up against the man that was his academy boss when he was in charge of Watford seven years ago.
And Warburton is seemingly ready to welcome Rodgers into the Scottish Premiership with open arms after offering some words of wisdom.
"If he asked me for my opinion of Scottish football I would tell him it's a fantastic environment. It is highly competitive," he told the Daily Record.
"The first advice I received from a good friend in Scotland was 'do not underestimate Scottish players and Scottish football.' It was great advice and that would be my advice to Brendan."
While Warburton brought several English players to the Gers last summer, he has still maintained a core of Scottish stars - the likes of Lee Wallace, Barrie McKay and Jason Holt - that have helped the players that have come from south of the border understand the expectation at Ibrox.
And that mix has helped the Light Blues power their way to promotion, a Challenge Cup victory and a Scottish Cup final. And with the Hoops boasting a similarly strong Scottish core, Rodgers may look at Warburton's advice - should he get the job - as the perfect place to start when thinking about constructing a side capable of winning the club's sixth league title in a row.