Celtic fans have allegedly been attacked in Warsaw before Wednesday’s Champions League qualifier against Legia Warsaw.
The incident is understood to have taken place at a bar in the city with at least one Hoops fan injured.
A spokesman for the Parkhead club said: ‘We are aware of an attack on Celtic supporters and are currently investigating.’
Celtic were in Poland for a third round Champions League qualifier as Ronny Deila’s team aim to reach the group stages of the tournament.
The Hoops play the first leg at the Pepsi Arena before welcoming back the Polish side to Murrayfield for the return leg on August 6.
– Scottish champions’ spokesman confirms club are investigating incident
– Incident understood to have taken place in Warsaw bar
– At least one Hoops supporter injured before third round Champions League qualifier