Edit. As
@Johnny75 said...
I think Mosquera can play for us and still go out on loan to a champ club
Registration
1. A player must be registered at an association to play for a club as either a
professional or an amateur in accordance with the provisions of article 2. Only
registered players are eligible to participate in organised football. By the act
of registering, a player agrees to abide by the statutes and regulations of FIFA,
the confederations and the associations.
2. A player may only be registered with one club at a time.
3. Players may be registered with a maximum of three clubs during one season.
During this period, the player is only eligible to play official matches for
two clubs.
As an exception to this rule, a player moving between two clubs
belonging to associations with overlapping seasons (i.e. start of the season in
summer/autumn as opposed to winter/spring) may be eligible to play in official
matches for a third club during the relevant season, provided he has fully
complied with his contractual obligations towards his previous clubs. Equally,
the provisions relating to the registration periods (article 6) as well as to the
minimum length of a contract (article 18 paragraph 2) must be respected.
4. Under all circumstances, due consideration must be given to the sporting
integrity of the competition. In particular, a player may not play official
matches for more than two clubs competing in the same national
championship or cup during the same season, subject to stricter individual
competition regulations of member associations.