The 26-year-old is a free agent when the season concludes, as he has not signed a new deal.
While the Cottagers are desperate to get him to renew, Adarabioyo will know that he can get a huge sign-on fee and a big wage from a top side in a few months.
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The likes of Liverpool, Tottenham, and now AC Milan are all involved in the race.
Other teams are likely to come into the mix, with Newcastle United desperate to sign defenders.
Manchester United are also in the midst of a squad revamp and may see Adarabioyo as a good fit for their budget.