Police were called after a glass was thrown at Sunderland striker Darren Bent's car while it was parked in Newcastle city centre.
In a message on Twitter, the 26-year-old claimed his Land Rover was targeted while he was shopping.
Northumbria Police said no-one was hurt in the incident, which happened at the city's High Bridge on Friday.
A police spokesman said inquiries into the incident were under way.
Bent, who scored in Sunderland's 5-1 defeat to Newcastle at St James' Park last month, has missed the last three Sunderland games with a hamstring injury, but has returned to training and could play in Monday night's Premier League clash with Everton.
The force spokesman said: "Police were called to High Bridge in Newcastle near to the Groat Market to reports that a drinking glass had been thrown at a parked Land Rover.
"Officers attended the scene and inquiries are under way.
"No-one has been injured and there are no reports at this time of any significant damage having been caused to the car."