Grzegorz Szamotulski has agreed to join Hibernian until the end of the season.
The former Dundee United keeper, 32, will complete his free transfer once Hibs secure international clearance.
Szamotulski told his new club's official website: "I'm pleased to have reached agreement with Hibernian and am now looking forward to playing again in the SPL.
"I enjoyed my last spell in this league and I'm delighted to be joining one of the leading sides in Scotland."
Paatelainen said: "I am delighted to have secured the services of Grzegorz Szamotulski.
"I have been looking for some time now for an experienced goalkeeper and Grzegorz fits that description perfectly.