Here are the rules - and they were NOT easy to understand
53.3 Emergency and Youth Loans. Subject to the provisions of Regulation 52.2, Emergency Loan and Youth Loan transfers shall only be approved in accordance with the following provisions:
53.3.1 Notwithstanding the definition of Parent Club, Emergency and Youth Loans may only be concluded with clubs affiliated (directly or through County Football Associations) to the Football Association unless any club not so affiliated plays in any of the competitions set out in Regulation 53.2.1.
53.3.2 Emergency and Youth Loans are permitted both during the Transfer Windows and, subject to the provisions of Regulation 53.3.5, also during a Closed Period between Clubs (or, as applicable, clubs) in membership of The Football League, The Premier League and The Football Conference (Premier Division).
53.3.3 During the Transfer Windows, Emergency Loans and Youth Loans are also permitted between Clubs and, as applicable, clubs in membership of the Football Conference (North), Football Conference (South), Northern Premier League, the Isthmian League and Southern League providing the rules and regulations of the respective league so allow. Any Emergency Loan concluded in accordance with this Regulation may be renewed during a Closed Period provided the renewal is simultaneous with the expiry of the immediately preceding period of the Emergency Loan.
53.3.4 Notwithstanding the provisions of Regulations 53.3.2 and 53.3.3, a Player cannot be registered on an Emergency Loan or Youth Loan:
(a) during the period of seven days after the end of a Transfer Window;
(b) in the first half of the Season, after 5pm on the fourth Thursday in November; and
(c) in the second half of the Season, after 5pm on the fourth Thursday in March
unless in accordance with the provisions of Regulation 54.
53.3.5 Only:
(a) Scholars who are in the second or third (if that option is exercised) year of their Scholarship Agreement; or
(b) Contract Players aged 20 or under on 1st July immediately preceding the Season in question,
may be registered on a Youth Loan.
53.3.6 It shall be a condition of any Youth Loan involving a Scholar, or a Contract Player who continues to qualify as an Academy Player, that for the duration of the period of the Youth Loan the Player continues to fully comply with the programme of education in place for that Player.
53.3.7 A Player registered on a Youth Loan may, provided this is agreed between the two clubs and the Player, continue to train with and/or play for his Parent Club (or club) in any match other than matches played as part of the Premier League Competition, League Competition, League Cup, Football Association Challenge Cup or Football League Trophy (First Team Matches). Participation by the Player in First Team Matches for the Loaning Club shall take precedence.
53.3.8 Any days on which the Player participates in a reserve team match and/or attends any training sessions for the Loaning Club (or club)) shall still count towards the period of the Youth Loan.
53.3.9 Except for the specific circumstances provided for in Regulations 53.3.11, 53.3.12 and 54, the minimum duration of any Emergency Loan and Youth Loan shall be 28 days and the maximum duration of an Emergency Loan is 93 days. The loan period is inclusive of the starting date and the finishing date. Youth Loans may not extend beyond the date of the Player's 21st birthday.
53.3.10 Emergency Loans and Youth Loans may contain a break clause but only where that break clause is exercisable after the expiry of the initial 28 day period of the loan.
53.3.11 Emergency Loans and Youth Loans involving goalkeepers (but not otherwise) may be subject to a recall clause within the first 28 days. Any recall may only be implemented in extenuating circumstances and with the consent of the Executive, such extenuating circumstances to be determined in the Executive's absolute discretion.
53.3.12 The Executive shall have discretion to extend the maximum duration of 93 days for an Emergency Loan in extenuating circumstances, such circumstances to be determined in the Executive's absolute discretion.
53.3.13 Subject to Regulation 53.3.14, where the Emergency Loan or Youth Loan of a Player expires (and is not renewed simultaneously) any subsequent Emergency Loan or Youth Loan of that Player to the same Club will be subject to a minimum duration of 28 days as set out in Regulation 53.3.9.
53.3.14 The cumulative total number of days of all Emergency Loans of one Player to the same Club may not exceed 93 days (unless extended by the Executive in accordance with the provisions of Regulation 53.3.12).
53.4 International Loan. Clubs may also sign players from foreign clubs (which, for the purposes of this Regulation means any club not affiliated to the Football Association unless such club plays in any of the competitions set out in Regulation 53.2.1) in accordance with the principles set out in Article 10 of the FIFA Regulations (International Loan) subject to the following provisos:
53.4.1 the onus is on the Loaning Club to identify whether the signing of the player from a foreign club is a permanent transfer or International Loan. Players may not be signed from a foreign club on any other basis;
53.4.2 Players signed on an International Loan must sign an employment contract with the Loaning Club in a form equivalent to the Standard Contract;
53.4.3 the defined term of Standard Loan in Regulations 53.2.5 to 53.2.7 inclusive shall be deemed to include International Loans such that International Loans shall count towards the quotas set out therein.
54 Emergency Loan of Goalkeepers
54.1 If all the professional goalkeepers at a Club are either certified by an independent medical practitioner as being unfit to play or are suspended, a Club may register (either before or after the deadlines laid down in Regulation 53.3.5), a further goalkeeper on a short term Emergency Loan in accordance with the following provisions:
54.1.1 The Executive shall allow a Club to sign such a goalkeeper for a period of 7 days (notwithstanding the provisions of Regulation 53.3.10), inclusive of the starting date and finishing date.
54.1.2 Any such short term Emergency Loan shall be subject to The League, in appropriate circumstances, having received (including by facsimile) the appropriate medical certificate(s) and the Executive having confirmed that the circumstances conform to the provisions of this Regulation.
54.1.3 The period of any short term Emergency Loan of a goalkeeper may be renewed for 7 days at a time but further medical certification must be provided on each occasion.
54.1.4 Any short term Emergency Loan in respect of the same goalkeeper may not exceed 93 days during any Season.
54.1.5 The provisions of Regulation 52.2.2 shall not apply to the Emergency Loan of a goalkeeper.