Arsenal goalkeeper Petr Cech was pleased with his clean sheet for their 0-0 draw with Europa League opponents Sporting CP.
The result sees Arsenal qualify from their group.
Cech also had a word for Danny Welbeck, who appears to have suffered a serious ankle injury.
He said: "They defended really well and we created half chances.
"We had a lot of possession. We did well to control the game and play well at the back and they didn't have a lot of chances. it took us a while to open them up and this is the kind of game where you need to score. It's disappointing not to score as we wanted to guarantee top spot.
"Danny [Welbeck]'s looked like a serious injury which is not nice to see and our thoughts are with him and also Stephan [Lichtsteiner].
"At half-time we knew we were doing good, we just need to push for the goal and maintain intensity. We had some good chances in the second half and close calls but unfortunately we couldn't put it in the back of the net. We take the points and qualification for the next round.
"It was down to them working well, they were very organised and have very good players so you have to control our emotion, and we lacked a little bit of the killer pass.
"We know we need to switch back to the Premier League and then we look to finish the job in Ukraine. It is tough when you are the favourites in the group and everyone plays with extra motivation against you."