Manchester United manager Sir Alex Ferguson is refusing to write off Chelsea's chances of winning the Premier League title even after his side's 3-0 win against Fulham lifted them ten points clear of the Blues.
The victory also gave United a five-point advantage over their nearest challengers, Liverpool, and seemingly on course to clinch their third successive crown.
However, Ferguson is aware that there are still 13 games of the season left and can remember times in the past when his side blew big leads in the title race.
He said after Wednesday's victory: "It's fair to say that Chelsea have an uphill fight to overcome us. But you can never be dead sure.
"Things can happen. You'll remember we were 12 points ahead of Arsenal back in 1997-98 and then we lost the league.
"We had a lot of injuries that season, though. Hopefully with the squad we've got now, we can cope with injuries like we've done in the last few weeks.
"That's been a development at this football club. We've got such a big squad, we can make changes.
"I was pleased for Wayne Rooney, it was a nice goal. He came in late, which I've seen him do many times, and scored with his first touch. So he's back and hopefully he stays back.
"He's 100 per cent. We're at the stage of the season where we won't take chances. If they've got slight injuries, they won't play. If they do, it could exacerbate the problem."