Barcelona is extremely active in the transfer market and has brought four big reinforcements so far.
Franck Kesi and Andreas Christensen arrived as free agents, while Robert Lewandowski and Rafinha were bought.
However, Barcelona cannot register any of the new players, who can only play in friendly matches for the time being.
The Catalans have a financial problem and although they have collected 500 million from the sale of TV rights, the debt is still very large.
In the future, the Catalans will have to solve this problem by selling several players, including Frankie de Jong and Memphis Depay.
The Spanish league does not allow the uncontrolled transfer of new players to prevent possible bankruptcy of clubs.