The Burnley goalkeeper has lost his place with Clarets, but is in England's squad for tonight's clash with Belgium after Crystal Palace's Sam Johnstone was ruled out due to injury.
"He's very assured, very confident," Carsley said. "We've talked about it. He's fine, absolutely fine. I think sometimes, because he's so low maintenance, you can almost go some camps without speaking so much to him.
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"To develop resilience you have to be in these kind of situations. He'll be back stronger."
"I think James deserves to be up there," Carsley added. "I think he's shown, in what he's done for us especially, that's he's an outstanding goalkeeper with real high-class potential.
"He has the mentality as well to go and fit into that group in terms of starting or being a support act. He's an all-round very exciting player. He's playing in the Premier League at such a young age and shown he has all the attributes."