Chelsea defender Branislav Ivanovic says he has to improve despite giving his side three massive points in the title race.
The 30-year-old was the hero for the Blues as he met Cesar Azpilicueta's cross in the 66th minute to score the winner away at Aston Villa.
But he says there are areas of his game he has to work on.
"The ball came very slowly and I was focused on the ball, trying to hit it well, and it was a great ball," Ivanovic told the club's official website.
"It was an important goal for the team, a great half-volley and I'm happy with the goal, but not so happy with my performance and I know what I have to do better."
Asked about the seven-point gap at the top of the Premier League table, the Serbian said: "We cannot be relaxed.
"This is a massive three points for us. The game was very tough but at the end of the day I think we deserved three points.
"We knew they hadn't scored for a long time, which made some extra pressure for them, but for us also.
"We knew they had to react and it was a very difficult game. In the end it was a massive three points.
"We don't have time to relax even one second. There are 14 games to go and we must stay focused. Seven points is big but this can change quickly."
