Regis has been impressed with Berahino, who has 12 goals for club and country this season, but believes he needs time to develop before stepping up from the England Under-21s.
He said: "He's simply too inexperienced for England. In a year's time, if he is still scoring goals on a regular basis, playing every week for West Brom then, yes, give him a crack at the senior team.
"A footballer needs to understand and be able to cope with the pressures that such a status brings."
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