JUSTIN Edinburgh insists there is only a "cigarette paper" between his Newport County side and the Mariners.
The Exiles return to Blundell Park tonight (7.45pm) just four days after their 3-0 defeat in the final match of the regular season.
However, Edinburgh could make up to eight changes to his side and insists that this evening's clash will be very different to Saturday's meeting.
"It's going to be cagey because I don't think either team showed their hand on Saturday," he said.
"It's going to be a tough game.
"They've got a good home record but we've travelled very well this season and I expect a good contest between two teams who were separated by a cigarette paper in terms of the league table.
"I think the emphasis will be on Grimsby at home with the crowd behind them, so at the start there will be a bit of caution from us.
"But we will look to impose ourselves on Grimsby as the game goes on and as we have done all season away from home.
"We want to make sure we're still in the tie ahead of Sunday and what will be a great occasion at Rodney Parade, but we'll be setting ourselves up to win the game.
"They have finished the season well at home with a good victory, but we were without seven or eight players.
"They might think they've got the psychological advantage but it will be a totally different game."
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The Exiles are aiming to end a 25-year spell in non-league football, with victory in the play-offs.
"We've transformed this football club in a very short space of time and I'm very proud of that," continued Edinburgh, right.
"This club has been out of the Football League for a long time and the players realise that they can go down in history.
"They know that they will be forever remembered as the team that took this club back into the Football League.
"We've over-achieved. We've travelled very quickly in a short space of time and maybe they've had a longer time building the squad at Grimsby but I don't think that matters.
"Now we're in it we want to win it.
"They are two cup games now and it's about who handles the pressure the best."
