Former Premier League ref Mark Clattenburg says Paul Tierney should've allowed Sadio Mane's final play for Liverpool before blowing for halftime on Sunday.

Discussing Tierney's performance for the 0-0 draw between the Reds and Manchester United, Clattenburg wrote in the Daily Mail: "There was only one moment of slight controversy and it came right on half-time.

"One minute of added-time was shown and the TV clock indicated 55 seconds had been played when Tierney blew his whistle with the ball in the middle of the pitch.

"He wanted play to finish in a neutral area, as is standard for referees. The problem was, in a split-second, Liverpool played a ball over the top and Sadio Mane was looking to get away on goal.

"Technically, Tierney should have waited until the minimum of one minute had been played. He was helped by the fact Mane and United defender Victor Lindelof then stopped playing, so we do not know what would have happened next.

"But I would not criticise Tierney for this incident. He had a very good game, it's just a shame we didn't have that real intensity."