The England striker has made it clear that he will not be taking anything for granted despite putting his club on course for an 11th consecutive league victory that restored their seven-point at the Premier League summit over Chelsea and Liverpool.
"Can I see any way we won't win the title? I'm not sure," Rooney said following the 2-1 victory over Newcastle at St James' Park.
"There are still 11 games to go and a lot can happen in those 11 games but obviously we are in a good position at the top of the league.
"But we have to make sure we stay focused from now until the end of the season, be professional and hopefully if we do that then we can retain the title."
Rooney is also confident goalkeeper Edwin Van der Sar will be unaffected by the personal blunder on Tyneside that saw him gift Peter Lovenkrands a goal as he was beaten for the first time in the league since United lost 2-1 at Arsenal last November.
"These things happen and Edwin knows he messed up for the goal but there have been times this season when he has won us games on his own," Rooney added.
"He is big enough and he will be able to move on from this.
"We were disappointed we went 1-0 down quite early on but we knew it would be a tough game with the pitch and the weather and Newcastle certainly made it a difficult game for us.
We did well to come back and get the two goals and pick up the three points." Rooney put United back on track by crashing the ball past Steve Harper in the first half before Dimitar Berbatov completed the recovery after half-time.
"I kept going trying to get behind the line and I think that is important.
The team kept going and kept threatening.
"It was a goal ball in by John O'Shea and I managed to get a good turn and then just put my foot through it and thankfully it has gone into the back of the net."