An "angry" Arsene Wenger has admitted to his concern at an "unpleasant" gap separating his Arsenal side and the pace-setters in the Premier League.
Arsenal slipped to a surprise 1-0 loss at Norwich City on Saturday courtesy of Grant Holt's first-half goal as the Gunners struggled to create a meaningful opening after going behind.
Ten points now distance Arsenal from league leaders Chelsea, and Wenger has expressed his frustration at a disappointing display by his players at Carrow Road.
"We gave an easy game away and I am angry," Wenger, who celebrated his 63rd birthday on Monday, said. "In the end, Norwich gave us a good lesson, but it is one I would rather not have.
"They wanted the win more than us, showed more desire and it is hard for me to admit that. Too many lessons like this and you stand at the end of the season with too many regrets."
He added: "The gap is very unpleasant. We had an opportunity that Tottenham could win and we could win, and we both lost. That of course makes the gap a lot bigger.
"You cannot say you do not worry about that, but what is more disappointing is that we could not score. After we went 1-0 down we had the ball for 70 minutes and could not score a goal."
Wenger was asked after the game whether he could look to sign a striker in the January transfer window, following a lack of firepower demonstrated against Norwich.
He said: "I cannot answer that question now. We did not create enough against Norwich, that is for sure, but we have players coming back and have to assess how things are progressing in January before making decisions.
"There are far too many players who are below what is required in the Premier League, and the players weren't at their best in terms of their concentration or commitment. We have to face the reality."