Arsenal manager Arsene Wenger hailed William Gallas after the Frenchman headed the only goal of Sunday's win against Chelsea.
Gallas profited from a mistake by Blues keeper Petr Cech to seal the three points against his former club, and move the Gunners back to the top of the Premier League table.
Wenger enthused: "He (Gallas) pops up when you need it.
"He is a leader. He shows the example. He did that against Manchester United in the last seconds. It shows he is a winner.
"Arsenal is a special club. William this season has taken that on board and he is completely the leader and represents how we want to behave. He is transformed completely.
"We have shown great character in the fight, in the one-to-one duels. We were dominant on that front and that is not the case usually.
"Overall, I think three points were deserved and reflect the great spirit in the side.
"Liverpool are not out of the title race. Neither are Chelsea because they showed they are a good team. I prefer that it remains a four-horse race because it is more interesting."