If during extra-time both teams score the same number of goals, the away goals will count double (and the visiting team advances). If no goals are scored during extra-time, the winner is decided by penalty kicks.
Please refer to the related link for more information.
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Only if the teams have scored same number of goals on EXTRA TIME. For example if on extra time the score is 3-2 it will NOT become 3-4.
The away goal rule only counts in the knock-out stages of the Champions league. The group stages rely on goal difference if two or more teams have the same amount of points.