The 24-year-old has successfully completed a medical and agreed personal terms to become the Reds’ first signing of the summer window.
Mac Allister will arrive at Anfield less than six months on from helping Argentina win the World Cup in Qatar last December, capping a highly impressive season with Brighton.
The midfielder told Liverpoolfc.com: “It feels amazing. It’s a dream come true, it’s amazing to be here and I can’t wait to get started.
“I wanted to be in [from] the first day of pre-season, so it’s good that everything is done. I’m looking forward to meeting my teammates.
“It was a fantastic year for me – World Cup, what we achieved with Brighton – but now it’s time to think about Liverpool and try to be a better player and a better human being every day.”
Watch: Mac Allister’s first LFC interview in full
Mac Allister’s move to Anfield comes after three-and-a-half successful seasons at Brighton following a January 2019 switch from Argentinos Juniors, where he immediately returned on loan for six months until a further temporary stint with Boca Juniors.
His Premier League debut came in March 2020 and he went on to make a total of 112 appearances for the south-coast club, 98 of which came in the Premier League. Indeed, he faced Liverpool as an opponent on six occasions.
In addition, Mac Allister netted 20 times overall for Brighton and claimed nine assists.
At international level he has 16 caps for Argentina, with one strike to his name to date – the opener in a 2-0 win over Poland in Group C of their successful World Cup campaign.
He made six starts at the tournament and laid on a goal for Angel Di Maria in La Albiceleste’s thrilling final triumph over France.
Mac Allister will become the seventh Argentinian to represent Liverpool.
He added: “Since I won the World Cup, I said that I want to win more trophies and I think that this club will help me to do that – that’s the aim and when you are in a big club like this one you have to win trophies. So, that’s what I want.
“Since I arrived here, I can see how big this club is – the players we have, the staff, everyone. I’m really pleased and looking forward to playing for this club.”
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