The press office of Polish side Zagłębie issued a statement regarding the incident at the club's training ground this morning.
"On Wednesday morning, during the training session of Zagłębie's first team, which was taking place on the training field on Kresowa Street, a group of men appeared, interrupted the training and then spoke to the coaching staff and players.
Given the behaviour of the masked men, the club notified the police, who sent a patrol to the scene. The circumstances of the incident are currently being established. At the same time, we would like to inform you that over the next 24 hours we will make public the personnel decisions regarding our club," the statement reads.