Merseyside Police is appealing for witnesses following an assault at Aintree Racecourse on Saturday, 6 April.
At around 5.10pm, shortly before the Grand National race, it was reported that a man was assaulted by another man, causing a fractured eye socket.
The incident occurred near the Lord Daresbury & Princess Royal Stand, on the racecourse side, near to the front rail.
CCTV and witness enquiries are ongoing to locate the offender and anyone with information is asked to come forward.
Detective Inspector Gary Stratton said: “Despite the good nature of the vast majority of racegoers it is disappointing to see that an incident such as this occurred with a man suffering a serious injury as a result.
“We are carrying out a number of enquiries and are particularly keen to speak to a man described as a white male with blonde hair, wearing a beige jumper and a checked shirt. We believe he may have vital information to assist our investigation and would ask him, or anyone who recognises the description, to please get in touch.”
Anyone with information is asked to contact @MerPolCC, 101 quoting ref. 19100160830 or @CrimestoppersUK.