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The BFU said in a statement the Sofia-based club have 14 days to pay da Costa or face a three-point deduction in the domestic league under FIFA regulations.
CSKA signed da Costa from Romanian club FC Timisoara in September 2008 but only four months later the 25-year-old made a rare move to bitter city rivals Levski Sofia.
The BFU did not reveal the amount the 31-times Bulgarian champions owed the player, while CSKA are disputing the fine and are likely to appeal within the next seven days.
Article continues belowDa Costa has since left Levski Sofia. ($1=1.391 Leva)
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