Barcelona won their Champions League encounter 4-2 in Prague, with the outstanding Fermin scoring twice on the night.
Afterwards, Sadilek admitted: "From the beginning we felt involved in the match. We were in the fight until the end; it was uncomfortable for them and they probably cooled down too. I liked that we were able to play an open game against them."
On Fermín, he continued: "I think the two goals we conceded in the first half wouldn't have happened in the league. Fermín's runs behind the defence are incredible; I've never seen anything like it and I've probably never played against a better player in this respect.
"The player who impressed me the most? There were other players like that. For example, De Jong, whom I know from the Dutch league, is my nightmare.
"When he was at Ajax, he was my rival, and I don't remember that match fondly."