Out-of-sorts Blues head into Sunday's Premier League finale on the back of three successive defeats.
The clash with the strugglers marks a timely opportunity for a return to form ahead of the FA Cup final.
With sixth spot also a possibility, it's a match Redknapp is desperate to win.
But the Pompey boss doesn't believe defeat will prove to be the disaster many people are tipping.
And he's convinced a potential fourth loss in a row would not affect their Wembley performance against Cardiff.
He said: 'It's going to be tight and we want to win, make no mistake about that.
'But it's not crucial we get a victory.
'There's nothing in the rulebook that says if you lose the game before a Cup final you cannot win the Cup.
'Everything doesn't hinge on this game, it's not going to affect anything really. You can't get carried away by it all.
'I want to beat Fulham, I want to win every single game we play.
'But there's nothing to say if we get beaten then we are going to play badly against Cardiff.
'The final's going to be a different game, on a different pitch, involving different players in different circumstances.
'You can't read into anything from what happens against Fulham.
'I've not actually been that disappointed in our form.
'We were beaten at Manchester City but circumstances were against us.
'Two of the goals were an absolute fluke and then we had a man sent off. You can write that one off.
'Blackburn was a tight game and not many teams beat them. That was a tough match.
'Then there was Middlesbrough, they are not exactly a bunch of mugs.
'They were unfortunate not to beat Manchester United the other week.
'We've lost three in a row – that has not happened for two years. It used to be that way every month six or seven years ago.
'Hopefully we can get a result against Fulham but it won't affect Wembley.'
Meanwhile, Redknapp has reiterated his promise to field a strong side against Roy Hodgson's team.
News that will no doubt be greeted well by Birmingham and Reading followers.
He added: 'I owe it to other clubs to put out a good team.
'I might well have rested a few players, but I'm not going to.
'Maybe most people will do that, perhaps I could look after myself and make 11 changes, that's been proven over the years with other managers.
'But I feel a bit of a duty to have a go.'

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