Chelsea striker Olivier Giroud admits there was frustration after their 1-1 draw at Eintracht Frankfurt.
The result still hands Chelsea the advantage ahead of their Europa League semifinal second-leg in London.
Giroud told RMC: "I think we're frustrated to go out with a draw tonight.
"They started very well in this game but in the end, the number of opportunities, we were far ahead. We should have killed this game in the second half, I feel frustrated tonight.
"They defended well but sometimes they were successful too. We were hurt very little but again, it's a shame. We will want to finish the job at home, it will do to make a clean-sheet."