Manchester United legend Roy Keane has labelled one key Liverpool player’s display at Old Trafford as ‘poor’. Liverpool will be disappointed after failing to take their opportunities against United on Sunday afternoon. Jurgen Klopp’s men had to settle for a 2-2 draw, with Luis Diaz and Mohamed Salah getting on the scoresheet. Despite taking the lead through Diaz, the Reds endured a frustrating opening 45 minutes as they failed to punish United. Salah certainly wasn’t at his best in the final third as the Egyptian wasted a few decent opportunities. The 31-year-old was visibly frustrated with Da…