CELTIC player Lukasz Zaluska was attacked in a Glasgow street in the early hours of yesterday morning.
The goalkeeper was targeted in Ashton Lane in Glasgow's west end.
A Police Scotland spokesman said: "We are investigating a report of a 32-year-old man being assaulted in Ashton Lane in Glasgow in the early hours of Monday 20 October.
"Officers are checking CCTV images and inquiries are continuing."
Police would not confirm reports that another Scottish Premiership player was involved in the incident. Zaluska signed for Celtic from Dundee United in 2009 and has mainly been the club's second choice goalkeeper.
He has played twice for Celtic in the league this season and has one international cap for Poland.
Meanhile, the cost of refurbishing the Olympic Stadium ahead of West Ham's move could rise by up to £50m due to the complexity of extending the roof.
The club would not have to pay of any increase in construction costs however, while stadium sources say there will be no delay in completion.
The London Legacy Development Company is in talks with constructor Balford Beatty about the increased cost.
Construction Enquirer magazine has reported that Balfour Beatty has asked for an extra £50m, but the firm would not comment on the report.
The Olympic Stadium is due to host 2015 Rugby World Cup matches in September and October next year, with West Ham to move in to the venue in 2016.
The work to strengthen the roof and extend it to cover the retractable seating over the running track has proved extremely complex and construction experts are using similar technology to that used on North Sea oil rigs.