The Polish defender joins Ian Black and Suso Santana in Casba Laszlo's new look squad.
Kucharski, 24, is a cultured defender who won the Polish Cup last season with Poznan and also featured in the UEFA cup with Amica Wronki.
Jose Goncalves has returned from his loan spell in Germany with Nuremberg, with Laszlo believing the rejuvenated defender will be a totally different player and hopes fans give him the chance to prove it.