Manchester United say they are aware of an alleged incident in Greece involving captain Harry Maguire.
The England defender, 27, is reported to have been arrested on the island of Mykonos on Thursday.
The club said in a statement on Friday: "The club is aware of an alleged incident involving Harry Maguire in Mykonos last night.
Last night hurt... Time to go away, reflect, recover and be ready to come back stronger next season. Your support throughout the season has been amazing, we hope to see a full Old Trafford ASAP We're in this together 🔴 #MUFC
A post shared by Harry Maguire (@harrymaguire93) on Aug 17, 2020 at 6:11am PDT
"Contact has been made with Harry, and he is fully co-operating with the Greek authorities.
"At this time we will be making no further comment."
United players are taking time off after their Europa League exertions earlier this month.
The club were eliminated by Spanish side Sevilla last Sunday.