Arsenal midfielder Granit Xhaka has been interviewed by police over an allegation he racially abused a staff member at London's Heathrow Airport on Monday.
The 24-year-old Switzerland international was not arrested but voluntarily attended a nearby police station after the incident was reported by a third party.
According to British media reports Xhaka, shown a red card in Arsenal's 2-1 win over Burnley in the Premier League on Sunday, was seeing off a friend when the alleged incident took place.
"Police were called at 19:29 (1929 GMT) on Monday, 23 January following an allegation that a member of staff had been racially abused at Heathrow Airport, Terminal Five," said a statement issued by London's Metropolitan force on Tuesday.
"The allegation was made by a third party.
"Officers attended and spoke with a man in his 20s. He was not arrested. He voluntarily attended a west London police station where he was interviewed under caution. Enquires continue."
Xhaka joined Arsenal from German Bundesliga club Borussia Monchengladbach for a fee in excess of £30 million ($38 million, 35 million euros) in pre-season.