By Sam Whitehead and Chris Charles

The feeling is that we've got a chance, but we know we'll have to be at our best Barry Hayles

Barry Hayles insists Plymouth can cause an upset when his side take on Watford in Sunday's FA Cup quarter-final.

The Pilgrims are the only Championship club in the last eight but Hayles believe they are capable of getting a result against the Premiership side.

The 34-year-old striker, said: "You never know what can happen. It's been a very good run.

"There's been a massive build-up to this game but I'm keeping the boys level-headed and they will be ready."

Hayles knows all about playing in an FA Cup semi-final after suffering the agony of defeat while at Fulham when they were beaten by Chelsea in 2002, and he hopes to get there again with Plymouth.

"That was definitely the biggest game I've played in," he told BBC Sport. "It was a Fulham side who had not long been promoted and even though we lost 1-0, just getting there was like a Cup final for us.

If you were to pick a fixture that would give us more of a chance in qualifying for the semis, it would be Watford David Morris

"I'd love to get there again. Watford are the nearest side to us out of the teams left in it, so the feeling is that we've got a chance, but we know we'll have to be at our best to beat them."

Midfield star David Norris admitted he was hoping for one of the big boys when the draw was made.

"In every round we've been in, I would have loved to have played at Manchester United or Chelsea - that would have been a great draw for us," he said.

"But if you were to pick a fixture that would give us more of a chance in qualifying for the semis, it would be Watford and then getting the home draw as well. It gives us a massive chance.

"We've had a couple of full houses at Home Park since I've been here and it does make a big difference. With 20,000 supporters - and the majority of them behind you - it's a great atmosphere to play in."

Ebanks-Blake has tipped the supporters to inspire Plymouth

Former Manchester United striker Sylvan Ebanks-Blake, who came through the Old Trafford youth academy, agrees the fans will be the key to victory on Sunday.

"There's a massive buzz around the place. We know the crowd are really going to be behind us on Sunday so we're all looking forward to it," he said.

"Our home form's been good this season and we want to try to turn Home Park into a fortress that teams won't like coming to. Hopefully that will be the case on Sunday."

While all the youngsters dream of glory, manager Ian Holloway must be glad of having a wise old head like Hayles around to keep things in perspective.

"The local papers have made us favourites, although I don't know how they've came to that conclusion," the hitman confessed.

"The fans are really excited and it should be a great atmosphere but we're trying to get the players to remember they're the underdogs, so we have to outplay ourselves when we get out on the pitch.