Gallas said: “Our exit was hard to stomach. I think about it a lot.
“What made it even harder to swallow was I told my team-mates to be extra careful at set-pieces.
“We conceded the goal as the result of a completely stupid and needless foul.
“The ball was in the corner and all we needed to do was to wait. It was down to youthfulness.
“We lacked finishing skills. We created far more chances than PSV yet failed to convert a single one.
“We had to rely on Alex helping us out by scoring an own goal.”