Liverpool have completed the signing of Alex Oxlade-Chamberlain from Arsenal in a deal believed to be worth up to £35million.
The Merseyside club have announced the 24-year-old England midfielder has signed a long-term deal, understood to be five years, at Anfield.
Liverpool moved for Oxlade-Chamberlain this week after the player reportedly turned down the chance to join Chelsea.
Oxlade-Chamberlain, who is currently on international duty, underwent a medical at England's St George's Park training base after agreeing terms with the Reds.
Speaking from the England camp, where he is preparing for World Cup qualifiers against Malta and Slovakia, Oxlade-Chamberlain told the club's website, www.liverpoolfc.com: "Firstly, I'm delighted to have signed for Liverpool and a big thank you to everyone here at the FA that has made this possible, using the facilities. It has been a massive help.
"I'm not going to say too much today. I'm here with England and we've got two big games coming up, so I want to focus on them."
The signing is Liverpool's second of the week after a deal to bring in midfielder Naby Keita from Red Bull Leipzig next summer was completed on Tuesday.
He is the club's fourth major arrival of this summer's window after Mohamed Salah, Dominic Solanke and Andy Robertson.
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The England international has once again found it difficult to establish himself as a first team regular with Arsenal this season.
In October, the 23 year-old conceded he has reached a point where he may need to join another club to become a first team regular.
While there is no guarantee of this materialising at Liverpool, Jurgen Klopp is preparing to lose in-form Sadio Mane for over a month during the Africa Cup of Nations, and is actively seeking a player capable of filling his boots.
Arsene Wenger is keen to keep Oxlade-Chamberlain at the Emirates having nurtured him for more than five years since his move from Southampton.
Any deal could be further complicated by the prospect of Arsenal strengthening one of the teams challenging them for the Premier League title.
Klopp is expected to be quizzed about the prospect of signing Oxlade-Chamberlain during a press conference on Thursday.
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Alex Oxlade-Chamberlain is to undergo a scan to determine the severity of the injury he suffered against Barcelona on Tuesday night.
The 22-year-old Arsenal midfielder suffered suspected knee and ankle damage in the 2-0 Champions League defeat by the Spanish giants.
There are fears that the England international faces a lengthy spell on the sidelines, meaning he would miss the friendly matches against Germany and Holland next month.
But Gunners manager Arsene Wenger has so far only ruled him out of Sunday's trip to Manchester United.
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Alex Oxlade-Chamberlain has suffered a setback in his recovery from a hamstring injury, ruling him out of Arsenal's Barclays Premier League clash at West Brom.
The England forward, who suffered the injury in the Capital One Cup loss to Sheffield Wednesday, is also expected to miss the key Champions League clash with Dinamo Zagreb next Tuesday.
Arsenal boss Arsene Wenger said: "He had a slight little setback on Monday but we checked by scan and there is nothing wrong but he is still a fraction short for Saturday."
England manager Roy Hodgson said Alex Oxlade-Chamberlain will "without a shadow of a doubt" make the World Cup squad after picking up an injury in the draw against Ecuador.
It looked as though the Arsenal midfielder's World Cup dreams were over after he picked up a knee injury on Wednesday.
But the England manager, who was speaking after the 0-0 draw with Honduras tonight, said: "It's time for the real thing now.
"Everyone is fit. Oxlade-Chamberlain is making good progress. I think he'll make the tournament without a shadow of a doubt."