The 24-year-old signed a long-term contract with Jurgen Klopp's side on deadline day in a deal it is believed could reach a value of £40m, having passed a medical while on England duty at St George's Park.

He had been tipped to join Chelsea after turning down a new contract offer from the Gunners worth a reported $A293,500 per week, but he is thought to have rejected the champion's advances in favour of a move to Merseyside.

"I'm currently away with England, so I'm at St George's Park," Oxlade-Chamberlain said in a message to Liverpool supporters.

"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. But I can't wait to get to Melwood."

Oxlade-Chamberlain adds to Liverpool's previous signings of Mohamed Salah, Andrew Robertson and Dominic Solanke.

Manager Jurgen Klopp added: "I am really, really happy we have got Alex signed.

"Since the last game I have been waiting and hoping we could make this transfer - and when I got the news he was ours it was fantastic."