"He's a fit lad, he looks like he's in great condition, looks like he looks after himself, he's a model professional so that won't be a problem.
"Whether it will be possible to do it, I'm not sure."
Assistant coach Joe Jordan believes the addition of Beckham to the Spurs squad would be beneficial as they continue to chase silverware on three fronts.
Jordan told BBC Radio 5 live: "He has a wealth of experience and no matter how well you are playing, when you go into the second half of the season and you've got Champions League and Premier League, which is a bit new for us in the same season, I think you need that little bit of nuance.
"To put that in your dressing room, whether the player starts or not, is vital and if we are lucky enough to get David Beckham on a short-term basis, it would be great value."
If Tottenham tie up a deal this week, Beckham could be in line to make his debut against his former club Manchester United at White Hart Lane on Sunday.
Tottenham have also been linked with Everton captain Phil Neville, although Redknapp acknowledged a switch would be "difficult".
And Toffees boss David Moyes moved quickly to dismiss any notion of the 33-year-old leaving Goodison Park for White Hart Lane.
"I spoke with Harry Redknapp briefly before the transfer window opened," he told Everton's website.
"[Tottenham chairman] Daniel Levy and [Everton chairman] Bill [Kenwright] had an even briefer conversation at our recent game against Spurs and mutually agreed that this would go no further.
"At no time was any offer made - nor would one have been welcomed. Phil Neville is our captain and is an important part of the Everton set-up."
Neville has made 224 appearances for Everton following his move from Manchester United in August 2005.
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