There we go, this should just about cover it:
Defintion of a loan: A “Temporary Transfer” shall mean the transfer of a contract registration effected in accordance with Rules V.6 to V.10.
Only ways to terminate said registration:
U.29.1. in the case of a Contract Player, upon it being transferred in accordancewith Rule V.11;
U.29.2. in the case of an Out of Contract Player in respect of whom the conditionsset out in Rule V.17 have been satisfied, upon a Transferee Club effectinghis New Registration;
U.29.3. in the case of an Out of Contract Player in respect of whom the saidconditions have not been satisfied, upon the expiry of his contract;
U.29.4. in the case of a Contract Player, upon his contract being terminated on the ground of his permanent incapacity; and
U.29.5. in the case of a Retired Player, on the expiry of a period of 30 monthscommencing at the end of the Season in which he stops playingcompetitive football.
^ none of the above are applicable to Broja except for cancellation of the contract (U29.1) if us and Chelsea agree on ending the loan and give his registration back.
This little bit alludes to the difference in being registered to a club and being in the squad list when discussing replacing players in a squad list:
"the Board will only consent to the replacement of the lost Player(s) in its Squad List with:
f. any player who was registered with (and eligible to play for) the Club prior to the suspension but who was not included in the Squad List"
^ this suggests there are players at a club registered but not in the squad list submitted.