Wayne Rooney's knee injury is even worse news for Manchester United fans than first thought, as statistics show Louis van Gaal's side's win percentage more than halves in the striker's absence.

The Old Trafford club have won exactly half of their 39 games in all competitions this season, and only 11 in 26 Premier League fixtures.

Their overall win percentage of 50 jumps to 53 when Rooney plays and more than halves when he is absent, dropping down to 22.

Manchester United struggle without Wayne Rooney with their win percentage dropping to 22 in his absence

When the England captain plays the win percentage for Louis van Gaal's side increases from 50 to 53

The 30-year-old is expected to be out for between six weeks and two months after damaging knee ligaments in the 2-1 defeat by Sunderland last Saturday.

Rooney has scored 14 goals in 32 games this season, with half of his haul coming since the start of the new year.

United, fifth in the Premier League and six points off the Champions League places, are also worse without Michael Carrick, who has missed 20 games this season and Daley Blind, though the Dutchman has missed only three games all campaign.

When Carrick does not play the percentage drops from 52 to 40, while in the absence of Blind it drops from 47 to 33.

Manchester United win more without goalkeeper David de Gea though he has missed only eight games

Manchester United have won only six of Marouane Fellaini's 15 appearances for the club this season

United a currently fifth in the Premier League

Surprisingly though United win more without the talismanic David de Gea, though the goalkeeper has only missed eight games this season.

The Red Devils have a win percentage of only 45 when he is between the sticks, but 50 when he does not feature.

When Marouane Fellaini plays, van Gaal's side have won only six of his 15 appearances while they have won 12 of the 24 fixtures he has not featured in.

Louis van Gaal looks dejected in the dugout during Manchester United's 2-1 loss to Midtjylland on Thursday

Despite Anthony Martial's bright opening season United's win percentage is 67 when he does not play

Curiously, despite Anthony Martial's bright opening season in English football, United are far more successful when the Frenchman does not play.