The young goalkeeper played a starring role in the only major shock of the third round on Saturday.
Kelly was between the sticks for Kingstonian as the Surrey outfit stunned Third Division Southend at Roots Hall.
And the 19-year-old was outstanding as Geoff Chapple’s men booked a tie at Bristol City in the last 32. They were the only non-league side to make it — Dagenham & Redbridge will replay against Charlton Athletic for the right to play Spurs at home in round four.
Kelly was desperate for competitive action with Ian Walker taking over reserve team duties after the arrival of Neil Sullivan.
The answer was a loan spell to Kingstonian and how he has grabbed his chance.
"It was a great experience," said a delighted Kelly back at Spurs Lodge. "We were under pressure from the first whistle but we managed to score early on and after that we spent most of the game in our box.
"Southend bombarded us but to be fair to the lads from Kingstonian they put in a great performance and all died for the cause.
"It was one of those days where you either let in six goals or keep them all out.
"Fortunately enough we defended tremendously well and everything that came into the box was cleared and anything that came my way I was happy to stop."
Kelly has only played a handful of reserve games and has enjoyed his time at the Nationwide Conference outfit.
He said: "I need games and that is one thing I’ve not been getting at the club at the moment because Walks has been playing for the reserves.
"I needed to go and get games and I’m happy the club let me go to Kingstonian.
"I understand the situation completely. We’ve two great goalkeepers here and it’s going to be hard for anyone else to get a game.
"I’m pleased to be able to go somewhere else to get a game and get my experience that way. There is no better place to get experience than in the third round of the FA Cup.
"But long-term I would love to stay at Tottenham. I’ve been here since I was 14 and I would love to stay here. I wouldn’t want to go anywhere else."
Kelly can now look forward to another high-profile tie at Ashton Gate on January 27.
H revealed: "It was disappointing when the draw was made because Kingstonian were hoping for Arsenal, Manchester United or Tottenham but now we can look at it as a game we can win.
"The way we turned Southend over if we can put in another performance we can definitely go there and get a win."
Gavin Kelly has emerged from the shadows to grab the FA Cup spotlight away from the Lane.