The incident occurred late in the game when Kúdela said something in Kamara’s ear, his hand covering his mouth.
After the game, Rangers manager Steven Gerrard spoke to the media where he confirmed that Kamara had told him he had been racially abused by Kúdela.
In a statement on Wednesday, Slavia Prague President Jaroslav Tvrdík said the club respected UEFA’s decision.
“Ondřej Kúdela shouldn’t have approached the opposing player,” said Tvrdík.
“I deeply regret this and apologize to Glen Kamara for a situation that has clearly put him and his team-mates and everyone associated with Slavia and Rangers in distress.
“I’m taking positive steps to prevent this from ever happening again at our club.”
On March 18, UEFA banned Kamara from playing the same game “for attacking another player”.
Neither Rangers nor Kamara responded to CNN’s request for comment.
The European Football Association also announced that it has suspended Rangers striker Kemar Roofe for four games “for attacking another player dangerously”.
The striker was sent off late in the same game after a brutal collision with Slavia Prague goalkeeper Ondřej Kolář.
After the match, Roofe also received racial abuse on social media and posted a screenshot of the abuse on his Instagram account.
“I could be here all night scanning all these types of comments,” Roofe said in the Post.
Last year, Facebook and Instagram announced they would set up a team to fight racism on their platforms and assess the racial prejudice in their algorithms. However, the clubs have urged these platforms to do more to hold users accountable.
Instagram told CNN at the time that it had continued to investigate Roofte’s post and removed a number of comments and accounts that were against the rules.