Sir Alex Ferguson says Manchester United can take control of the Premier League title race if they beat Chelsea at Stamford Bridge on Sunday.
United recorded a 1-0 win over Arsenal at Old Trafford on Monday night.
Park Ji-sung's solitary first half goal extended their unbeaten start to the season to 16 matches and left them two points clear of the Gunners and Manchester City, whilst still having a game in hand.
And Ferguson knows, if his side can come away from Sunday's trip to Chelsea with another three points, they will start to feel increasingly confident about landing a record 19th league title.
"Sunday is a massive game," said Ferguson. "That will go a long way to establishing what happens at the top of the league.
"We are 16 games undefeated. Now we have to make it 17."
After scoring seven on their last league outing a fortnight ago, United showed a different side to their character, turning in a superb defensive performance to restrict the visitors to just a single chance.
In contrast, United had four excellent ones, including a missed spot-kick from Wayne Rooney which would have sealed the points 17 minutes from time.
"I was surprised at Wayne hitting it over the bar," said Ferguson. "I have never seen him do that before. He normally puts his shots on target.
"Against Rangers he hit it hard and low into the corner. Today he ballooned it over the bar."
