But Petkovic hopes they can put their form behind them when the Swiss take on Portugal in the semi-finals this week.
"For us as a team it was great to have so many players who have such great experiences. That Shaqiri was able to win the Champions League was fantastic," he said.
"We are very proud. It's excellent to have him and Granit on board – playing the Europa League final is also something special. All of those experiences strengthen us as a team.
"Shaqiri came back and there was a lot of euphoria. Now we are focusing on the game tomorrow."