This is a list of Bulgarian football transfers for the 2017 summer transfer window. Only transfers involving a team from the two professional leagues, First League and Second League are listed.
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The 2020–21 First Professional Football League, also known as efbet League for sponsorship reasons, was the 97th season of the top division of the Bulgarian football league system, the 73rd since a league format was adopted for the national competition of A Group as a top tier of the pyramid, and also the 5th season of the First Professional Football League, which decides the Bulgarian champion. Ludogorets Razgrad were the defending champions for the ninth consecutive time.
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