Keith Hill insists Rochdale are going have to be at their very best to topple Pompey in the FA Cup on Sunday.
The Blues head to Spotland on the back of five straight wins and looking to secure a spot in the third round of the historic competition.
But Hill's side are aiming to make it another year to remember having enjoyed recent Cup success.
The Dale reached the fifth round last season before being knocked out by Premier League side Spurs in a replay at Wembley.
They’re out for similar success this campaign and aim to knock out the highest-placed team in the competition.
Hill is aware of the size of task his troops face against the League One leaders.
But the boss believes his side have the quality to pull off an upset.
He told Rochdale’s official website: ‘It’s a game that is winnable.
‘We’ve got to be competitive, we’ve got to be at our very best.
‘But we’ve got no fear going into the fixture.
‘They’re going to be favourites, there’s no question about that.
‘We’ve had great success in the FA Cup over recent years and we’re looking forward to the experience again against an excellent side.
‘Without trying to be politically correct or incorrect, they are the men’s team of the league with respect to knowledge and know-how.
‘They’ve put in some excellent performances.
‘They’ve got a squad of players that can deal with the pressure of being top of the league.
‘They’re and outstanding side, there’s no question about that.
‘It’s a fixture in isolation that we believe they can win.
We have to make sure we’re better when we last played them, especially coming up against the best team in League One.’