The Blues won 0-5 to reach the Europa League quarterfinals.
Giroud said: "I'm very pleased with all the goals I scored and assisted for Callum [Hudson-Odoi]. It was a great team performance today.
"Maybe the second one was the best goal.
"I was in the right time, at the right place and it was a right foot finish which is unusual for me. We did well on set-pieces, which is nice, because they can help you to win matches."