Hakim Ziyech's proposed loan from Chelsea to Paris St-Germain is in danger of collapse because the documentation to complete the transfer was not submitted in time.
The 29-year-old is in Paris expecting to be confirmed as a PSG player but the registration has not been completed.
It remains to be seen if there is any solution, but as it currently stands Ziyech would have to return to Chelsea.
Ziyech was the Blues' first signing following their transfer ban in 2020, arriving from Ajax for £33m.
However, Chelsea have signed forwards Mykhailo Mudryk, David Datro Fofana, Noni Madueke and Joao Felix this month.