By Kieran King Former Premier League referee Mark Clattenburg has admitted Liverpool should have been awarded a last-gasp penalty during their 1-1 draw against Manchester City on Saturday. Liverpool were incensed after Alexis Mac Allister went down inside the box in the 98th minute. The Argentine appeared to be caught in the chest by Jeremy Doku, who got some of the ball but followed through into Mac Allister as the Reds midfielder went down clutching his upper body. Referee Michael Oliver waved away appeals and VAR official Stuart Atwell did not overturn the decision for a clear and obvious e…