Captain John Terry has warned Manchester United that Chelsea won't give up in their pursuit of a third successive Premiership title.
The Blues are currently six points off the pace at the top of the table but their Premiership meeting with Tottenham on Saturday takes place five hours before United take on Portsmouth.
That means Chelsea could be just three points behind the leaders by the time they kick-off at Fratton Park and Terry has challenged his team-mates to keep up the pressure on Sir Alex Ferguson's side.
"All we can do at this stage of the season is keep winning, winning, winning," said the Blues and England skipper.
"It's such a busy period but if we do keep winning, we're going to be successful."
United's penultimate game of the campaign is a potential title deciding trip to Stamford Bridge on May 9 and Terry believes the clash could well be pivotal.
"Manchester United are doing well, there's no denying that, but anything can happen and they've still got to come to our place," he added.