Cardiff defender Krystian Bielik is expected to face an FA probe into an incident involving a young Portsmouth fan.talkSPORT understands the FA are ‘aware’ of the altercation during Cardiff’s 2-0 defeat at Fratton Park on Saturday and are awaiting the referee’s report.Bielik could land himself in hot water over the incidentShutterstock EditorialBielik appears to grab the home supporter around the neck as he went to retrieve the match ball from the crowd.Pompey boss John Mousinho apologised for the incident after Cardiff counterpart Brian Barry-Murphy claimed Bielik had been slapped in the face during the incident.The fan involved was later ejected from the ground, much to the fury of Pompey fans on social mediaThe ex-Arsenal defender’s shocking altercation with the supporter in the second half led to a stoppage of around three minutes.With the Bluebirds 2-0 down and chasing a late comeback, Bielik – a summer arrival from Championship rivals West Brom – lost his cool as he went to retrieve the ball in the 70th minute.What happened with Bielik and the Portsmouth fan?Instead of handing it back to the 11-cap Poland international, a young-looking fan proceeded to throw it over his head.In response, the 28-year-old appears to have grabbed the supporter around his neck.The fan then pushed the ex-Birmingham man away while appearing to slap him in the face.Fellow Pompey supporters jumped up in anger, in shock at what they had witnessed.Camera footage then caught the fan in question gesturing that he had been throttled by Bielik.View Tweet: https://t.co/eYrhALmOwiA few minutes before the chaos, a separate Pompey fan could also be seen launching a ball off the back of Perry Ng’s head.The officials immediately looked to get the game under control, leading to a break of around three minutes.Referee Ben Speedie spoke to both captains and managers before allowing the game to resume.Bielik was already on a yellow card having been cautioned in the ninth minute.But he faced no extra punishment, as he eventually left the pitch as a substitute in stoppage time.Bielik appeared to grab a Portsmouth fan by the neckXThe Pompey supporter gestured that he had been throttled in the aftermath of the incidentXNow he could be set for a fine or ban once the FA launches their probe into the event.It has also been claimed the supporter in question was ejected from the ground before the match finished.Neither Cardiff nor Portsmouth commented on the incident on social media.Goals from Conor Shaughnessy and Marezi either side of half-time proved to be the difference for the hosts.The result lifts Portsmouth up to 13th spot, while Cardiff remain in the relegation zone in 22nd place, having failed to win any of their five league games.