“They are working on another level with the wages they can offer," he said.
"We liked Barry and Santa Cruz but, when it came to it, we just weren’t at the races."
Redknapp is renowned as one of the canniest operators in the transfer market. However, so far he has failed to bring any new faces to White Hart Lane ahead of the the new season.
And the 62-year-old insisted that he may not even sign a single player this summer if he feels they will not improve what is already - in his opinion - a good squad.
“I have spoken to the chairman, Daniel Levy; we’ve decided if we can’t get players who will improve the team, then we’re not going to bother," he said.
"We’ve already got a decent squad, many of whom are going to get better. We can push to finish in the top six if we improve our away results.”
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