Jarvis, whose only goal this season came in the Hammers' win over Cardiff in the previous round, says he is wary of the threat posed by Burnley.
"Burnley have done extremely well this season," he said. "I know quite a few of their players so I know what they are all about.
"A cup tie is always a great game to play in. We're away so hopefully we will have a good turn out by the fans and give them something to shout about by getting through."
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