Liverpool have completed the signing of the England mifielder Adam Lallana from Southampton.

The 26-year-old underwent a medical on Friday after Southampton accepted a bid - believed to be in the region of £25m - for the player.

Liverpool spent the weekend finalising the details of Lallana's contract, understood to be five years in length, and have now confirmed the deal has been concluded after all the necessary paperwork was completed.

Lallana is Brendan Rodgers' third signing of the summer, after his Southampton team-mate Rickie Lambert and the Bayer Leverkusen midfielder Emre Can, whose move from Germany was ratified yesterday with the official opening of the transfer window for registrations.