The 22-year-old admitted it was a wrench to leave Burnley, but he is relishing the challenge of pitting his wits against the best of the Premier League.
"I could not turn down the opportunity to play in the Premier League, though. We do not have any fear about playing anybody.
"It is going to be an exciting year. We want to show we can do it in the Premier League.
"Southampton have got ambition. We showed that to get back in the Premier League and I do not see them dropping out of it again."