Adam had looked to be nearing a switch to Liverpool on a frantic climax to the January window. Spurs boss Redknapp has had a low-key month but revealed chairman Daniel Levy instigated a last-ditch move for the Scotland midfielder.
Redknapp told talkSPORT: "Daniel rang me late on and asked if I like Charlie Adam. I said 'yes, he's a fantastic footballer'. He said do you want him, I said 'can we get him?'.
"We pushed on and tried to do it, Daniel was confident he could get it through. It went to the wire but we missed out by minutes.
"Daniel dealt with it. Apparently the boy was definitely up for coming. Apparently the chairman couldn't get hold of two shareholders who had to sign the forms as well. It's just one of those things.''
Despite seeing moves to Liverpool and Tottenham collapse, Adam vowed to give his all for Blackpool for the rest of the season. He told Sky Sports News: "It's been a crazy day.
"I'm still a Blackpool player and I want the Blackpool fans to know I'm totally committed to playing the best I can for the club, and I will do my best to help us achieve the highest possible league finish.''