"We settled with Blackburn and have reached agreement with Spurs," Yorks said.
"We're just awaiting clearance. It's for six months, with a one-year option. It all unfolded quickly."
Before the transfer deadline closed Redknapp said he was interested in signing Nelsen.
"We just need to see whether I can take another central defender because I've got William Gallas out long-term through injury," he told the Daily Mail.
"I'm hoping to sign Ryan Nelsen on a free until the end of the season. I think he's a great competitor and a good sort to have at your club. Always liked him."
Transfer announcements can still be made after the window shuts however if Nelsen's contract has been axed by Blackburn then he can sign with another club whenever he wants.
Nelsen has played just one game for Blackburn this season after struggling with a knee injury he picked up last year.
Blackburn currently sit in the relegation zone while Tottenham are third on the English Premier League table after beating Wigan 3-1 today.
- HERALD ONLINE