Watford boss Walter Mazzarri says Everton are underperforming.

Mazzarri is not expecting the Toffees to roll over in the televised clash, despite the fact their visitors have won only one league game since September 17.

"I think Everton are a strong team and at a similar level to Southampton when we met them," he said. "They have been having a good season until now.

"Although I think they can do better with the squad they have and players, they are still not far away from sixth place in the league, and it's a team we will have to respect. It will not be an easy game."