The French defender, 26, will arrive on a six-month loan deal, though Wanderers boss Gary Megson will have the option to make the move permanent at the end of the season for around £6million.
A Zenit source told The Sun: "A deal is almost done and Sebastien will probably spend the next six months in England."
Reports suggest either Puygrenier or West Ham defender Calum Davenport will miss out on a move to the Reebok stadium this January. Decision time for Gary Megson has arrived.....