The defender says United can take some belief from their performances against the Championship's better teams this season.
Liam Cooper has suggested that Leeds United's record against some of the strongest teams in the Championship can give them confidence that they can cause an upset when they face top flight opposition in the FA Cup this weekend, the Yorkshire Evening Post reports.
Steve Evans' men travel to Vicarage Road to face Watford for a place in the quarter-final of the competition. And while Leeds' current run of form may lead supporters to doubt whether they can deny the Premier League side a place in the next round, Cooper claimed that the team's ability to put in good performances against top teams should give the side the belief that they can surprise the Hornets.
"I love the cup. It's a brilliant competition. I love the tradition and you want to get as far as you can. As a footballer, you want to test yourself against the best and now we have a great opportunity to do that," he told the Yorkshire Evening Post.
"It's a big one for us and we'll have a big following down there.
"We've done well against the good sides and Watford are definitely a good side. They've done well this season. We'll have to be on top of our game but who's to say we can't go down there and cause an upset?"
While the Whites' run of one win in their last nine league games is unlikely to concern Quique Sanchez Flores too much, Leeds will point to their performance in their most recent outing as a good indication of what they are capable of.
During the goalless draw with promotion-chasers Middlesbrough, United showed the kind of fighting spirit they will need if they are to knock Watford out of the competition.
While Aitor Karanka's men were unlucky to have a goal disallowed during the clash at Elland Road, United were arguably on top for much of the game, and were only denied from turning their pressure into goals by two fantastic saves from Boro goalkeeper Dimi Konstantopoulos.
And if Leeds can replicate that same level of performance when they face the Hornets, and have a bit more luck in front of goal, then perhaps, Evans' side will cause an upset and book their place in the next round.