Redknapp's side defeated Derby County in the Championship playoff final to earn their place back in the top flight after just a season away.
The 67-year-old has admitted that the club have learned from their past mistakes in regard to their transfer policy.
He told reporters: "We're not just going to bring players in willy-nilly. We've got to make sure anyone who comes in is the right character and will come in and do a good job for the team. That's all that's important.
"And it'll be a scrap everywhere else. I've not even thought about a player. I've not even thought about what kind of player we're looking at, because you don't know what division you're going to be in."