Yep that was last years rules.
This years.
8.13 List A has to be submitted by the following fixed deadlines:
a) 24 June 2013 (24.00 CET) for all matches in the first qualifying round;
b) 11 July 2013 (24.00 CET) for all matches in the second qualifying round;
c) 25 July 2013 (24.00 CET) for all matches in the third qualifying round;
d) 12 August 2013 (24.00 CET) for all matches in the play-offs;
e) 2 September 2013 (24.00 CET) for all further matches from the first match
in the group stage up to and including the final.
18.14 For the three qualifying rounds and the play-offs, a club may register a
maximum of one new eligible player on List A after the above-mentioned
deadlines, provided the quota of locally trained players is respected. Such
registration must be completed by 24.00 CET on the day before the relevant
first-leg match and the club’s association must confirm in writing that the new
player is eligible to play at domestic level at this time.
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18.15 If the registration of such a new player causes the number of players on List A
to exceed 25, the club must remove a currently registered player to reduce the
squad to 25 players again.
Conditions for registration: List B
18.16 Each club is entitled to register an unlimited number of players on List B
during the season. The list must be submitted by no later than 24.00 CET on
the day before the match in question.
18.17 A player may be registered on List B if he is born on or after 1 January 1992
and has been eligible to play for the club concerned for any uninterrupted
period of two years since his 15th birthday by the time he is registered with
UEFA. Players aged 16 may be registered on List B if they have been
registered with the participating club for the previous two years without
interruption.
Subsequent registration
18.18 For all matches from the start of the round of 16, a club may register a
maximum of three new eligible players for the remaining matches in the
current competition. Such registration must be completed by 3 February 2014
(24.00 CET) at the latest. This deadline cannot be extended.
18.19 One player from the above quota of three who has been fielded in a UEFA
club competition group stage match for another club in the current season
may exceptionally be registered, provided that the player has not been fielded:
a) in the same competition for another club; or
b) for another club that is currently in the same competition.
18.20 One or more players from the above quota of three who have been fielded
only in the first, second or third qualifying round or play-offs of the UEFA
Champions League or UEFA Europa League for another club are entitled to
be registered.
18.21 If the registration of such new players causes the number of players on List A
to exceed 25, the club must remove the necessary number of currently
registered players to reduce the squad to 25 players again. The quota of the
“locally trained players” must be respected when registering new players.
Newly registered players must wear set numbers which have not yet been
assigned.
18.22 If a club cannot count on the services of at least two goalkeepers registered
on List A because of long-term injury or illness, the club concerned may
temporarily replace the goalkeeper concerned and register a new goalkeeper
at any time during the season and complete the official registration list A with
a goalkeeper fit to be fielded. An injury or illness is considered long-term if it
lasts at least 30 days as of the day the injury or illness occurred. In case the
recovery of the goalkeeper occurs before this 30 day period, the player must
remain out of the players List A until the end of such period.