Hall was named in England's squad for the first time on Thursday.
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Howe said on Friday morning: "I am delighted for him. He has a had a really good start to the season.
"He's very consistent, really mature displays. There is still a lot to come from him, we are seeing him evolve week in, week out. He is adding layers to his game all the time. It’s a great achievement for someone so young and we are delighted for him.
"We signed a talented player, there's no doubt about it. He just had a few things to work on, as we all do, regardless of age."