The Spurs boss wants his side to concentrate on collecting league points in a bid to finish in the top four for the second consecutive season.
'It is hard balancing the Champions League with the Premier League,' said Redknapp.
Fulham first: Harry Redknapp has warned his side that they must win in the Premier League
'But they've got to concentrate on the trip to Craven Cottage. That is the key now.
'The league position is all important because unless we win the Champions League we are not going to qualify for the Champions League next year.
'If we want to play Champions League football like Manchester United, Chelsea and Arsenal invariably do every year we have to finish in the top four again. That is our priority.
'We also want a good run in the Champions League but if you go out of the Champions League and finish halfway up the table, at the end of the year if you are not in European football it is not good.
'These next two league games for me are massive.'
Hit or miss: Redknapp is yet to decide whether to rest King against Fulham to save him for the Inter Milan match
Redknapp will leave it late to decide whether to play central defender Ledley King at Fulham.
King, because of his chronic knee problem, cannot play two games in quick succession.
Redknapp said: 'The only juggling act I've got is Ledley. He's a fantastic player but if I play him tomorrow he doesn't play on Wednesday. If I play him tomorrow he could play again next Saturday so I get two league games out of him.'
Younes Kaboul and William Gallas, meanwhile, are back in training and David Bentley is on his way back from injury.
Long-term absentee Jonathan Woodgate, who has travelled the world in his search for a cure to his chronic injury problems, has had another injection in his troublesome groin and Redknapp says: 'We are staying positive and hoping he will play again.'
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