Ronaldo and Saha back to fire Man. United

Manchester United are ready to unleash goal-happy Cristiano Ronaldo and Louis Saha when the Premier League leaders take on bottom club Watford tomorrow.

Last weekend's FA Cup ties mean a midweek programme for the top-flight clubs, plus a League Cup semi-final, second leg between north London enemies Arsenal and Tottenham Hotspur.

United, with a six-point lead over champions Chelsea, are taking no chances with a Watford side who already look set for a quick return to Division One.

Ronaldo, given a week off to spend in Dubai, and Saha, who had a bruised knee, will both be back after missing Saturday's 2-1 FA Cup win over Portsmouth.

Ronaldo has been on sparkling form with the Portuguese winger and the French striker scoring 25 goals between them this season.

Watford could also face Wayne Rooney after the England striker came off the bench to score both goals, including a stunning 20-metre chip shot against Pompey.

Ferguson had planned to rest him but is now re-considering in the hope that Rooney, who also scored in the previous weekend's 2-1 defeat by Arsenal, is on a hot streak.

"If he can get into the scoring form which he did last season and get on a run of scoring single goals, I tell you, he'll make some difference to our team," Ferguson said.

Chelsea, with 51 points to United's 57, can ill-afford to slip up against a Blackburn Rovers side who have won six of their last eight games on all fronts, including a victory over third-placed Liverpool.

Jose Mourinho will be hoping captain John Terry makes his long-awaited return from back surgery.

Terry has not played since a win over Newcastle on Dec. 13 and his absence from central defence has been a big factor behind their recent dip in league form.

Chelsea can take some comfort from a couple of easy League Cup and FA Cup wins, over fourth division Wycombe Wanderers and third division Nottingham Forest, along with a 4-0 drubbing of a Wigan side hovering above the drop zone.

Blackburn should give them much more of a game, though, and a better test of their desire for a hat-trick of titles.

Liverpool, with 46 points, sense a chance to seize second place if Chelsea's bout of the wobbles were to continue.

Rafael Benitez's men have an ideal fixture today to keep the pressure on Mourinho's men - away to relegation battlers West Ham.

Today: 8.45 p.m. Portsmouth vs Middlesbrough; Sheffield United vs Fulham; West Ham vs Liverpool. 9 p.m. Reading vs Wigan.

Tomorrow: 8.45 p.m. Chelsea vs Blackburn. 9 p.m. Bolton vs Charlton; Manchester United vs Watford; Newcastle vs Aston Villa.

League Cup semi-final, second leg 8.45 p.m. Arsenal vs Tottenham.