The midfielder, 24, spent four seasons at the Amex.
He became a hit with Brighton supporters for his all-action style of play.
And after 20 goals in 112 matches, Mac Allister secured a summer move to Liverpool.
Jurgen Klopp’s side paid an initial £35million transfer fee to land the Argentina World Cup winner.
Mac Allister has been a success story so far, shining in 10 games as a No6.
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