The 17-year-old defender is close to completing a move to St James' Park, with the deal expected to be going through in the next couple of days.
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The deal could ultimately be worth around £1million to Swindon but Allardyce believes the player would benefit from a loan spell in the second tier of English football.
Sam Allardyce: "He is only 17 and he is obviously one for the future. And yes, there is a possibility Ben will be allowed to go out on loan.
"But first we want him to stay here for two or three weeks so that we can look at him and he can look at us."