Liverpool F.C. defender Martin Skrtel suffered a a torn hamstring during his side's 3-0 defeat at Watford on Sunday.
Liverpool F.C. manager Juergen Klopp suffered his first away defeat in the Premier League.
Martin Skrtel was charged with violent conduct on the basis of video evidence after referee Martin Atkinson missed the incident, which occurred at the end of United's 2-1 win at Anfield on Sunday.
Brendan Rodgers's Liverpool, who had Fabio Borini sent off, are now 17 points below leaders Chelsea and nine points below the top four, while Arsene Wenger's Arsenal -- destroyed 5-1 on their previous visit in February -- trail the Champions League places by four points.
Reigning champions Manchester City twice came from behind in a 2-2 draw away to Liverpool that denied Brendan Rodgers his first Premier League win as Reds manager.
Liverpool manager Brendan Rodgers has taken a gamble by resting Steven Gerrard, Luis Suarez, Martin Skrtel and Glen Johnson for Thursday's Europa League clash against Scottish club Hearts.
Liverpool defender Martin Skrtel insisted on Thursday that he is looking forward to the upcoming Premier League season, playing down reports that he is being targeted by Manchester City.
A Martin Skrtel own goal allowed Fulham to record their first ever top flight league win on Merseyside in 42 attempts as the London club prevailed 1-0 over Liverpool on Tuesday in their Premier League clash.
Kenny Dalglish secured his first ever victory at Villa Park as a manager as Liverpool once again enhanced their aspirations of a top four finish with a 2-0 win on Sunday.