Watford defender Adrian Mariappa believes the Hornets can cause Manchester United problems in their televised clash on Sunday.

Walter Mazzarri's side have scored in every match this season and put four goals past West Ham United in a stunning comeback last weekend.

Jose Mourinho's side head to Vicarage Road on Sunday, off the back of their derby defeat to Manchester City in the Premier League, with Mariappa confident the hosts can give them a difficult afternoon.

“We can definitely cause them [Man United] some problems," Mariappa said.

"They will be coming to our ground as well. Every team in the Premier League nowadays is there for the taking.

"It’s all about just performing your gameplan well on the day. In the last game, to score four goals away from home is testament to the firepower we have.

"I’m sure they’ll be doing their homework on us and taking the game very seriously which they should be."