Alexis Sanchez believes Arsenal sometimes "lack the hunger" to become Barclays Premier League champions this season.
The Gunners blew a big chance to increase the pressure on leaders Leicester when they were beaten at home 2-1 by Swansea on Wednesday night.
"If we go out on to to the pitch with hunger to become champions, to win the Premier League or the Champions League we can achieve it," said Sanchez.
"There are great players here, I train with them daily and they have got the mentality and the desire to win. But sometimes we lack the hunger, the mentality that we are winning 1-0 when we go out on to the pitch.
"Sometimes we lack this hunger to believe that we can be champions.. To go out on to the pitch feeling that we are already winning 1-0."
Meanwhile, Tottenham boss Mauricio Pochettino does not believe Arsenal's experience of challenging for the title gives the Gunners an edge in the race at the top.
"If they have players that have the advantage to win the title, what happened against Manchester United or Swansea (on Wednesday night)?," the Argentinian said.
"We are capable of beating Manchester City away. (On Wednesday night) against West Ham was difficult but sometimes we use a lot of topics in football. Football is simple, not too complicated.
"Different clubs sometimes sign a player or a manager with a big background or big trophies behind them. Sometimes they have success and sometimes not. You never know. Football is not an ordinary business."