The 28-year-old has passed a medical and joins on a three-year deal, subject to receiving a work permit.
Petrov, whose former clubs include CSKA Sofia and Wolfsburg, becomes new manager Sven-Goran Eriksson´s fourth signing after Rolando Bianchi, Gelson Fernandes and Geovanni.
© Copyright PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms