Redknapp criticised the Braga players for their perceived theatrics and felt his side were treated unfairly by Ceferin.
"They were diving all over the place. They played well, they won the game, but I just felt every time there was a tackle someone rolled around, it was a yellow card. It was a poor game," he said.
Portsmouth's next group match is against AC Milan at Fratton Park on 27 November. They then travel to Wolfsburg before playing Heerenveen at home.
"Our passing, especially the final ball in was poor and we missed some injured players but it's not all over yet," Redknapp added.
"We've still got two big home games in the group - one against AC Milan - and it's still all to play for."
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