The Seasiders were desperately keen to keep hold of their attacking midfielder and saw off concentrated attempts by Liverpool to land him, but it was Spurs who almost pulled off a deal.
Chairman Daniel Levy instigated a last-ditch move for the Scotland midfielder, which only failed after two of Blackpool's share holders could not be found and their signatures were needed to see the deal complete.
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."