By Jamie Spencer Liverpool defender Kostas Tsimikas has described Darwin Nunez as a ‘goal machine’ following the Uruguayan’s third goal in his last three starts and expects more of the same. Nunez netted Liverpool’s only goal in Wednesday night’s Premier League win over West Ham, a header assisted by Tsimikas crossing from the left. He also found the net in the recent defeat by Arsenal and against Rangers in the Champions League. The former Benfica player, who will be Liverpool’s club record signing at £85m if all add-ons are triggered, appears to over the blip that saw him struggle following …