Bolton have become the second club to demand compensation from Barcelona over the transfer of Marcos Alonso last summer, according to reports in Spain.
Fourth-tier Spanish outfit Union Adarve accused Barcelona of fraud and filed a complaint to FIFA last month after allegedly learning that they deserved compensation from the LaLiga giants following Alonso's free transfer at the start of the season.
The left-back arrived at the Nou Camp last September shortly after Chelsea terminated his contract, reportedly taking a sizeable pay cut in order to sign for Barcelona amid their ongoing financial difficulties.