Chelsea and England winger Callum Hudson-Odoi was arrested on suspicion of rape in the early hours of Sunday morning.
Police and an ambulance were called to an address in London at 03:53 BST to a report of an unwell woman.
When emergency services attended, a woman reported that she was raped. She was taken to hospital.
Hudson-Odoi, 19, was arrested at the scene and has since been released from custody.
He has been bailed to return on a date in mid-June as enquiries continue.
Chelsea have declined to comment.
Hudson-Odoi, who has three England caps and in September signed a new five-year contract with Chelsea, was the first Premier League player to test positive for coronavirus.
He made a full recovery and, like other Chelsea players, is waiting to return to training before any proposed restart to the season.
Some reports have suggested the woman involved visited Hudson-Odoi from another address.
Lockdown rules specify that only one person from each household may meet as long as they remain outdoors and keep two metres apart.