Manchester United boss Sir Alex Ferguson rates Arsenal as a bigger Premiership threat than Chelsea.

United leapfrogged both of their main challengers yesterday to take top spot with an emphatic 3-0 victory over Fulham at Old Trafford.

Now Ferguson wants to ensure they keep their foot on the pedal as he fears it is the Gunners who could deny them a record 19th title.

The United boss said: "Every game is vital now. At the moment it is looking like the tightest Premier League we have had.

"We are back in the lead but Chelsea have a game in hand.

"It's also going to be a hard-fought tussle with Arsenal coming strongly now... and I have a suspicion they might yet mount the biggest challenge.

"To a certain extent the title is in our hands because Chelsea have to come to Old Trafford and naturally that will be a massive match. But, as I say, I am wary of Arsenal if they don't suffer too many more injuries to key players."