The goalkeeper is on-loan at Pompey from Manchester City.
“He's a great fella and he has a massive career ahead of him, for a lad of 19 he has an old head on young shoulders. I can't speak highly enough of Gav, in terms of ability and quality, it has shown through in his games for Ireland and for us," says Williams.
“He has been brought up well, has good manners, he's not one to be arrogant, he is fully committed to being one of the best goalkeepers in the world. As long as he keeps working hard and keeps the right mentality, he can do that.
“I don't see any reason why he can't go all the way, he's performing at a superb level now and he's only 19. I can't think of another keeper in football who is doing that. He's a good person first and also a good footballer."
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