Aston Villa's new signing Zat Knight was arrested during a drug raid just hours before being unveiled at Villa Park.
The defender, who has been released on bail, completed his £3.5m move from Fulham to his boyhood heroes.
West Midlands Police said officers executed a warrant under the Misuse of Drugs and Firearms Act at an address in Poppy Lane, Erdington.
A force spokesman said: "Two men, aged 26 and 27, were arrested on suspicion of Class A drugs offences.
"The 27-year-old man has since been released on police bail."
A quantity of controlled drugs was seized during the raid, which is said to have occurred at around 5.30am.
The Sun has reported that the 27-year-old was Knight and a spokesman for Villa has acknowledged that Knight had been arrested, but stressed that he had not been charged with any offence.