The Seasiders have opened talks with the 25-year-old defender after having a bid accepted by the League One side on Tuesday.
Ince is hopeful of tying up a deal for the former Celtic youngster, who spent last season on loan at Birmingham, in the coming days
"I think Paul is a very good player," Ince told the Blackpool Gazzette. "He showed that during his time at Birmingham last year. He gets up and down the park well.
"It's nice to know we have a fee agreed, even if we are a little bit away from sorting personal terms at the moment. There are one or two little things to sort out."
Birmingham boss Lee Clark revealed he tried to sign Caddis permanently in January only to see his bid rejected by the Robins.
When he became available again this summer Clark conceded the St Andrew's club couldn't afford his transfer fee.
"Everyone know my thoughts and how highly I rate him" he told the Birmingham Mail. "But once people start offering a fee, that's us out of the equation.
"He would have loved to have joined us. But it wasn't to be. We wish him well."