Jurgen Klopp believes a first-half injury to Roberto Firmino cost his Liverpool side their rhythm as they failed to break down Manchester United at Old Trafford.
The league leaders played out a 0-0 draw with their great rivals, a result that saw them reclaim their place at the top of the table by a single point from Manchester City.
But it leaves Klopp’s side with no margin for error as they seek to cling to their slender advantage in the race to become Premier League champions.
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Firmino was forced off shortly before the break after picking up an ankle injury, and his replacement Daniel Sturridge failed to sufficiently trouble the home side’s defence as the game petered into a stalemate.