Chelsea FC captain John Terry broke the leg of a security guard as he drove out of the club's Stamford Bridge ground then left the scene, police said.
The club said his 4x4 hit the man as he drove slowly through photographers and fans after Tuesday's 1-0 defeat by Inter Milan in the Champions League.
Police said the man broke his leg but the club has said it was badly bruised.
It said Terry, who drove off, was aware of "a lot of contact" with his car but did not think anyone had been injured.
A Metropolitan Police spokesman said Terry was later breathalysed by Surrey Police at his home in Oxshott and investigations were continuing.
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