Blues' stutter worries Mourinho

London - Chelsea's disappointing 1-1 home draw with Southampton on Sunday could mean the Premier League title battle is no longer a two-horse race, according to manager Jose Mourinho.

It has appeared for months that the championship crown would go to leaders Chelsea or second-placed Manchester City but Mourinho believes it would be unwise to rule out teams like Arsenal and Manchester United.

"I agree that Chelsea not winning at home is not a good result but we had a five-point lead before the match and afterwards we have a six-point lead," the Portuguese told reporters at Stamford Bridge.