Adarabioyo was close to leaving Fulham in June after rejecting a new contract.
According to the Standard, the centre-back could now start dialogue with the London club.
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Monaco were keen to sign the Nigerian-born defender in August but had an 8.5m bid snubbed by Fulham.
The 26-year-olds contract will expire next summer and can sign a pre-contract agreement with clubs overseas from January 1.
Fulham will be hoping to have Adarabioyo back from injury in the coming weeks after he underwent groin surgery.
He joined Fulham from Manchester City in 2020.
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