The Rs became the first team in Premier League history to fail to win any of their first 16 games in a season when they were held to a 2-2 draw by Wigan at the DW Stadium on Saturday afternoon.
Redknapp said: "It we don't win a game or two then I wouldn't ask them to spend any more money. I think it would be unfair to the owners.
"I wouldn't tell them to go and spend big money on a couple more players if we're that far adrift. You've got to be realistic.
"I'm just hoping we can get that win or two and then I'm sure they'll have a go, because they've had a go in the summer. They've done whatever was asked of them and look what they've ended up with.
"It's difficult. I can only work with what I've been given. It's like you've dealt me a hand of cards and this is what I've got. We've left ourselves with a squad that's got no balance to it, we've got no strikers."