Barcelona's signing of Martin Braithwaite would leave Leganes unable to defend themselves by going to the transfer market to sign a replacement for the striker, a key player in their fight against relegation.
As SPORT detailed yesterday, neither the RFEF nor La Liga have a rule in place which would allow them to sign a player if they were to lose someone to their release clause. The only legislation that exists is for clubs to make an emergency signing in case they lose a player to injury for more than five months.
If a club loses a player to their release clause late in the transfer window, they are given one month to sign a replacement. This rule does not exist outside the window, though.
However, SPORT has learned that La Liga are studying the possibility of giving Leganes special permission to sign if they do lose Braithwaite. It would have to be cleared by the RFEF, too.
If it was to go through, it would signify a change to the current rules.