Arsene Wenger admits his team couldnt kill of the game as Swansea came from behind to beat Arsenal 2-1 at the Liberty Stadium.
Arsenal scored the first goal of the match through Alexis Sanchez who finished off the assist from Danny Welbeck.
Sigurdsson equalised with a lovely free-kick before second-half substitute Bafetimbi Gomis found the net in the 78th minute to make it 2-1.
And the Arsenal manager said after the match: “We had the best chances. It is a place where it is always tight.
“When we were 1-0 up, we lacked spark and killing instinct to take that game on our side and win it.
“They didn’t give up. We lost some challenges and we couldn’t get the second goal.”
Wenger also said he wasn’t thinking of the gap between Chelsea and Arsenal but worried they dont keep clean sheets.
“I worry that we concede the goals,” Wenger added.
“At the moment, we have different worries. We just lost a game that we feel we shouldn’t have lost.
“In a realistic world in football, you have to win the games you feel you can win.
“If you want to challenge for the title, you have to win the games you feel you can win.”