Liverpool manager Jurgen Klopp has claimed that referee Mark Clattenburg made a mistake in allowing the first goal in his side's 3-0 defeat to Watford to stand this afternoon.

The Hornets took the lead inside three minutes at Vicarage Road when Nathan Ake scrambled the ball home from close range, although replays showed that stand-in Liverpool keeper Adam Bogdan briefly had two hands on the ball before it was knocked out of his grasp.

It was Bogdan's error that created the chance initially, however, and Klopp acknowledged that the goal was ultimately the keeper's fault.

"It was a bad start to the game. Of course the first ball from Adam Bogdan, he should keep and he drops it. Having seen it again usually it is a foul but it is 1-0 and our reaction was really bad," he told Sky Sports News.

"We lost our mind and stopped playing football. The second goal was very easy, we can defend this better. We tried a bit in the first half and changed a bit at half time. The start to the second half was very good, we could have scored two goals, but we didn't and then the third goal. Yeah, game over.

"The first one is [Bogdan's] fault, but then both hands on the ball, that is the goalkeeper safe, he has the ball, I think the referee didn't see it. It was the wrong decision but we made more wrong decisions."

The defeat means that Liverpool are now four games without a win in all competitions and remain ninth in the Premier League table.