Quote:
10.01 If a club refuses to play or is responsible for a match not taking place or not being played in full, the Control and Disciplinary Body declares the match forfeited and/or disqualifies the club concerned in combination with the following fines:
a) prior to the first qualifying round €10,000
b) prior to the second qualifying round €10,000
c) prior to the third qualifying round €10,000
d) prior to the play-offs €50,000
e) prior to the group stage €100,000
f) during the group stage €250,000*
g) prior to the round of 16 €350,000
h) prior to the quarter-finals or semi-finals €500,000
i) prior to the final €1,000,000
* minimum per outstanding match
10.02 Exceptionally, the Control and Disciplinary Body can validate the result as it stood at the moment when the match was abandoned if the match result was to the detriment of the club responsible for the match being abandoned.
10.03 If a club is disqualified or for any reason withdraws from the competition before completion of its matches in the group stage, the results of all of its matches are declared null and void, and its points forfeited.
10.04 In all cases, the Control and Disciplinary Body can take further measures if the circumstances so justify.
10.05 A club which refuses to play or is responsible for a match not taking place or not being played in full loses all rights to payments from UEFA.
10.06 Upon receipt of a reasoned and well-documented request from the club or clubs concerned, the UEFA administration may set an amount of compensation due for financial loss.
There's bound to be something in the Disciplinary Regulations as well.