"We believe the arrival of Seedorf could promote the image of football in Shenzhen and China," the club said in an announcement.
Shenzhen sit eighth in the table, but will hope to gain promotion to the top flight, being just six points behind second-placed Guizhou with 14 games to play.
(Reporting by Shravanth Vijayakumar in Bengaluru; editing by Clare Lovell)
