The Croatia midfielder has been the subject of firm interest from Chelsea this summer and there had been suggestions the deal could be revived before the summer window closes at 11pm, but Redknapp said he was "one million per cent" convinced that chairman Daniel Levy would not sell Modric.
Levy has been adamant that Modric will not be allowed to leave White Hart Lane, and Redknapp promised Modric would not be on the move as he told Sky Sports News: "No, that won't happen. One million per cent."
Peter Crouch could be among the players leaving Tottenham though, with Redknapp confirming QPR as well as Sunderland are among the clubs keen on the England striker.
"There's three or four clubs wanting him and he wants to play football," Redknapp said. "He's too good not to play. He's an outstanding player."
Tottenham have been linked with a late move for Bolton and England defender Gary Cahill, and Redknapp did not deny an interest.
"I've always been an admirer of Gary Cahill. We've got to wait and see," he said. "We do need to shift one or two. So we'll see how the day pans out.
"I'm sure the chairman will be busy on the phone all day.
"David Bentley needs to move. David's got great ability. I think he could go somewhere. He could do a great job for someone I'm sure."
If enough players leave, Redknapp confirmed he could bring in a couple of new faces. Joe Cole, linked with French club Lille, could yet be among the additions.
Source: PA
Source: PA