The Gunners blew a two goal lead to draw 3-3 with Fulham on Saturday.
When asked whether Arsenal were still in the title race, he said: "I feel, yes, of course. Yes, why not? It is a concern, because we looked quite solid defensively until now, and against Fulham we looked very fragile. If we had scored the penalty, nobody speaks about it.
"You had some dodgy moments in the game, but you would have won. We were close to doing it and have to do it next game."