Portsmouth head coach John Mousinho apologised to Cardiff City after home fans clashed with defender Krystian Bielik during Saturday's Championship match at Fratton Park, which Portsmouth won 2-0. In the 72nd minute, Bielik became involved in a physical altercation with a supporter while retrieving a ball, with Cardiff manager Brian Barry-Murphy saying his player had been "slapped in the face"; footage circulating online appeared to show Bielik grabbing a young fan around the upper body, prompting some Portsmouth supporters to gesture that they believed the fan had been grabbed by the throat.

In the incident's aftermath, a separate fan threw a ball at the head of Cardiff defender Perry Ng, leading to both supporters being ejected from the ground; no players were booked. Mousinho said he wanted Fratton Park to remain a difficult atmosphere for opponents but that the incident had gone too far, while Barry-Murphy praised match officials for handling the situation well and said the club and the Football Association would review the matter and implement appropriate action.