The centre-half is off contract at the end of next month.
Journalist Craig Hope, who works for the Daily Mail, reports that Newcastle are close to signing the centre-back.
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Adarabioyo's move to Newcastle is expected to be completed in the next few days.
The 26-year-old scored twice in 25 competitive appearances for Fulham this season.
Newcastle is also looking at centre-back Lloyd Kelly, who is coming off contract at Bournemouth.