Sarr featured for Chelsea in the 1-0 defeat, settled by Kevin de Bruyne's second-half winner.
Afterwards, the defender told chelseafc.com: "Yes, it was really frustrating today.
"We came here with a plan and I thought we did really well. Defensively we were strong. We offered them little opportunity and that was the plan. We could feel their frustration.
"Then obviously we had chances to score and that's why I'm frustrated and disappointed."
On De Bruyne's goal, Sarr continued: "Yeah, yeah great shot. But that was the plan, to stop this happening. We did enough, so it was frustrating with how it went.
"We go home frustrated because we had chances to score in the first-half and the second-half."
Of his own situation, Sarr added: "Yeah, it's good to feel the confidence and I'm happy to play, whether it's on the side or centrally in the back three. But really, we all want to not only play but to win games."
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