Pompey boss Richie Barker has admitted that he has a plan in place for Tuesday evening's game at Spotland as the South Coast club visit Spotland for the first time since 1979.
Speaking ahead of the game, Barker told his local BBC radio station: "They are top of the league and top of the form table and they are riding high and full of confidence.
"We've analysed them, we've watched them to ensure we can go there with a game plan.
"It was never going to be an easy run of games. All I can worry about is me holding my nerve and ensuring the players hold theirs."