The Daily Mail reports the Spurs star was punched as his north London home was targeted by robbers, but that he suffered only a minor facial injury.
The report claims two culprits stole jewellery and watches, with CCTV of the incident passed to the police, who have opened an investigation.
Alli is said to have been spending the lockdown with his brother, their respective partners, and a friend.
In a statement, Metropolitan Police said no arrests had been made and inquiries were ongoing.
A spokesperson said: "Police were called at approximately 12.35am on Wednesday, May 13, to reports of a robbery at a residential address.
"Two males gained entry to the property and stole items of jewellery, including watches, before fleeing.
"Two male occupants at the property suffered minor facial injuries after being assaulted. They did not require hospital treatment.
"There have been no arrests. Enquiries into the circumstances continue."
Alli confirmed the incident on Wednesday evening , writing on Twitter: "Thank you for all the messages. Horrible experience but we’re all okay now. Appreciate the support."
Additional reporting from Press Association
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