Manuel Almunia feels Arsenal must develop a "killer instinct" in front of goal if they are to sustain a genuine title challenge this season.
The Gunners missed the chance to leapfrog Chelsea to the top of the Barclays Premier League on Saturday night when they conceded an equaliser at Sunderland in what was the fifth minute of added time.
Goalkeeper Almunia feels Arsene Wenger's men have the quality needed to last the distance, but cannot afford many more wasted opportunities if they are to get ahead of Chelsea and Manchester United.
"In the last second of the game, it is a big kick against us, but this is football," Almunia told Arsenal TV Online. "Last season we won some games in the last few minutes, and this can happen in every game.
"Even though we were winning 1-0 with not much danger in our box, we needed to get another goal to make sure the three points would be for us.
"I think we have to be more focused in the final few metres and have to have a killer instinct [in front of goal]."