The Englishman, signed from Blackburn Rovers last week, scored on debut in the 3-1 defeat.
"I think it was a very good first game for him," Saints boss Hasenhuttl said post-match.
"He showed immediately that he is good in the game and he's quick.
"He can go in behind with a low centre-of-gravity.
"I think we have a new striker who can score goals. This is good."
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