Chelsea manager Jose Mourinho played down his team's Premier League title hopes on Friday, saying their position at the top of the table was "unrealistic" because they have played more matches than Manchester City.
Chelsea, who host fifth-placed Tottenham Hotspur on Saturday, lead the standings with 63 points, four more than Liverpool and Arsenal, with 10 matches to play.
They are six points clear of Manchester City, who are playing Wigan Athletic in the FA Cup on Sunday and will have played three games fewer than Chelsea by the end of the weekend.
"We expect a very tough game against a very good Tottenham team who are fifth and so are the biggest threat to the top four teams," Mourinho said.
"We want to guarantee our top-four place and win, but I keep saying, the position at the top is not a realistic situation.
"It is realistic when all the teams have played the same number of matches and then you can say 'I am in front, I am behind', so when some teams have played more matches than other teams the situation is not real."
Tottenham are fifth on 53 points, but come into Saturday's clash without a win at Stamford Bridge in 24 years.
Yet they arrive with the best away record in the league this season to face a Chelsea team who have picked up more points at home than any other.
Chelsea have not lost any of the 74 home league games they have played in Mourinho's two spells there as manager but he expects a tough examination of that record on Saturday.