Tim Piper had watched Tongue play when he was just an 11-year-old and placed a 100-pound bet at odds of 500-1 that he would play a Test match for England in the future.
"I've kept the bet slip in a cupboard all these years," Piper told BBC Sport.
"I just thought to myself, 'it must be worth 100 pounds'. If he doesn't make it, he'd make us proud anyway. This is just a bonus for him to get in the test team.
Tongue, the son of Piper's club teammate Phil, was a spinner at the time and the 56-year-old had seen enough to realise he was destined for great things.
"There was this little kid who bowled leg-spin, googlies and top-spinners. It was like Shane Warne," Piper added.
Tongue, 25, switched to fast bowling when he moved to the Worcestershire academy and Piper said he kept an eye on the bowler who went on to pick up 162 wickets in first-class cricket.
Tongue had, however, contemplated retirement during a 15-month shoulder-injury layoff from 2021-2022 before two operations and botox injections fixed the issue.
He finally earned his England call-up for this week's one-off Test against Ireland at Lord's starting Thursday after injury concerns over fellow quicks James Anderson and Ollie Robinson.
"He had all those injuries, but I never gave up on him," Piper added. "I kept thinking, 'maybe it can happen'. These last two weeks have been a mad turnaround."
