Gray, 19, scored his first senior goal as Tottenham earned a crucial away win over Crystal Palace to help relieve some pressure on Frank.
It wasn’t all good news for Spurs, however, with wonderkid Bergvall forced off in the 63rd minutes with an apparent groin injury.
Speaking after the game, Frank was full of praise for Gray, saying: “I think he, showed why he has got a very good potential in many ways. I think it's another fine performance overall today.
“Talking about resilience, he made the mistake in the Nottingham game, played another good game against Liverpool, growing as a young man, and you can just see he was alert, I love that goal, because he's alert, he's seen where the ball will land, and he's ready on it.
“I think he showed a lot of quality, he covered the ground so well. I think he's excellent in the pressing game. The defensive transition was brilliant, to close it down. And then I think he's good on the ball, but of course in a game where we're not top in that area.”
When asked about whether Bergvall will be fit for the game against Brentford on Thrusday (January 1), Frank responded: “Yes, I hope so (that he is okay). Of course, we will assess him tomorrow.”