Currently plying his trade at Cardiff City, joining from West Brom this summer, Bielik, 28, has featured in all three games since his move, failing to win any.
With his side 2-0 down against newly promoted Portsmouth on Saturday (September 5), Bielik was involved in an altercation with a fan in the 70th minute.
The defender went to retrieve the ball for a throw in, only for a young fan to throw the ball over his head.
In immediate retaliation, Bielik reached into the stands and appeared to grab the spectator by the throat.
The fan then stood up, pushed Bielik away, and appeared to slap him in the face, sparking a furious reaction from the surrounding home supporters.
Despite the shocking incident, Bielik avoided any immediate punishment from the referee, but was eventually substituted in added time.