Sunderland defender Titus Bramble has reportedly been arrested.
Bramble has been arrested on suspicion of sexual assault and possession of a class A drug, police have said.
The 30-year-old was being held for questioning by Cleveland Police following an incident in the early hours.
A force spokeswoman said: "A 30-year-old man from Wynyard has been arrested on suspicion of sexual assault and possession of a class A drug.
"He is currently being questioned by police and inquiries are ongoing."
The club said it was making inquiries but did not want to say anything more at this time.
A Sunderland spokesman said: "The club is looking into this matter but due to ongoing police investigations is unable to comment further at this stage."