The Irish international's goal gave Southampton a 1-nil win on the night and a 2-nil victory on aggregate.
It's the Saints first major final appearance in 14 years, while Liverpool are now on a run of one win in their last seven games.
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Either Hull or Manchester United await Southampton in the final.
They meet this evening in the second leg of their tie with United holding a 2-nil advantage from the first leg.
Kick off at the K-Com Stadium is at 7.45.
