Don't fight the lawAccording to law 13.5 from the League Cup's official website: "In the Semi-Final ties, if the aggregate score is level at the end of the second game an extra half-hour shall be played. If the aggregate scores are still level at the end of extra time the tie shall be decided by goals scored away from home counting twice.
"If the teams remain equal after this procedure the tie shall be determined by the taking of kicks from the penalty mark in accordance with the Laws of Association Football."
Basically, it adopts its own methods (key to note this is only used for the semi-finals as the previous rounds are only one tie finished on the night by extra time and penalties if needed).
If the scores remain level after both legs, but someone has scored more away goals in the tie, it won't matter as there will be extra time anyway, but away goals then become active from extra-time onwards.
Goals, lovely goals
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In terms of last season, Liverpool were given an extra 30 minutes lifeline to try get back into the game against Chelsea, before Branislav Ivanovic popped up in the 94th minute to secure the away goal rule wasn't needed.
The first leg at Anfield saw Liverpool draw 1-1, Eden Hazard converted a penalty early on for an away goal which was later equalised by Raheem Sterling.
The second leg then saw the scores finish at 0-0 after 90 minutes. If the game was in Europe, Liverpool would have been out. Instead they had another half-hour to grab an all important goal, as Hazard's away goal from the first leg now became active.
Instead, Branislav Ivanovic popped up with a header and made it 1-0 (2-1 on aggregate) and the confusing League Cup away goals rule wasn't needed.
There has only been one instance of the rule working since the Millennium. In 2006, Wigan won their first leg at home 1-0, and lost their second leg 2-1 at the Emirates, but that vital 118th-minute strike from Jason Roberts crushed Arsenal's hopes of reaching the final.http://www.liverpoolecho.co.uk/sport/football/football-news/capital-one-cup-semi-finals-10690648