Manchester United midfielder Ryan Giggs feels the club still have their work cut out to remain ahead of Liverpool.
United's title success last season was their 19th, eclipsing Liverpool's long-standing record. The Old Trafford club had trailed by 11 when Liverpool won their 18th league crown in 1990 and veteran Giggs now wants to build a big lead over the Merseysiders.
Ahead of the clash between the two sides on Saturday, the 38-year-old told Inside United: "They're a club similar to us with massive history. We're the two most successful teams in the country, so we know we've got to perform and play well to get anything from any game against them."
He added: "We know we're in for a tough game. It's the club we tried to catch for so long and now we've caught them the challenge is to stay ahead."
The champions are facing a stern test of their credentials in February.
Saturday's game comes after Sir Alex Ferguson's men needed to battle back from 3-0 down to claim a draw at Chelsea last week.
United must also travel to third-placed Tottenham before the end of the month.
Giggs said: "We know it's a tough run of games but these are the games you want to be playing in. We're not quite at the make-or-break part of the season, but it's an important time and we know that if we win these games then we'll be in good shape going into the run-in."
United midfielder Tom Cleverley is thought to be close to returning to action and, it has been reported, could even be in contention to face Liverpool.
The 22-year-old has been out since October with an ankle injury.