In the summer of 2015 Petrović managed Litex Lovech for three matches, leading them to first place in the 2015–16 A PFG standings, but left the team in early August for family reasons. In early December he returned to the team from Lovech once again after the position of manager was vacated by Laurențiu Reghecampf. Petrović guided them to the 1/2 finals of the Bulgarian Cup. However, it eventually turned out to be another short-lived appointment for the Serbian head coach, as Litex were expelled from the A PFG by the Bulgarian Football Union after their players were ordered off the pitch in a heated derby match against Levski Sofia held on 12 December.