Sir Alex Ferguson is refusing to rule Chelsea out of the Premier League title race despite Manchester United's seven-point lead and the Stamford Bridge revolt against interim boss Rafa Benitez.
United and second-placed Manchester City extended their advantage over Chelsea in midweek after Benitez's second game in charge ended in another goalless draw.
But Ferguson believes it is too early in the a season to declare a two-horse race.
Out of sorts: Chelsea haven't tasted victory in their last six Premier League games
'It's coming to the end of November and I don't think you can be certain of saying it's going to be a two-horse race at this time,' he said.
'Over the years we've always hoped that the top five or six are all capable of winning the league but eventually it ends up a two-horse race. It's been like that for years, and last season there was big gap between ourselves and City.
'The important thing is to look at yourselves. You want to stay up there every time and it's not an easy league to do that.'
Tough battle: Ferguson expects Reading to put up a stern test
United were given a sharp reminder of that when they lost at Norwich a fortnight ago and Ferguson expects another tough battle at Reading tomorrow.
'Away games are getting more difficult,' he added. 'Norwich was a good example of that. They fought like tigers and were really motivated. It was a difficult day for us.
'We expected another difficult game like Norwich tomorrow. The job Brian McDermott has done there is excellent. It took him a little bit of time to get his ideas across but in the second half of last season came from nowhere to win the league.'
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