Lallana, 26, will wear the No 20 shirt at his new club
'I'm so excited for the next chapter of my career, coming to a special club like Liverpool. I'm quite humbled and I just can't wait to get started.
'Hopefully I can settle in quickly, and I will give it my best throughout the whole time I'm here. I hope I can add something to the team and hopefully we can win trophies while I'm here, because that's why I'm here - for success.'
Lallana was confident he can slot in seamlessly to the breath-taking style of football that carried Liverpool within touching distance of the Barclays Premier League title last season.
He said: 'Watching the run-in towards the end of last season was unbelievable, not just for myself but everyone involved in football.
'It got the hairs on the back of my neck standing up just watching them, and the style of football they were playing.
'Deep down, I was thinking to myself: hopefully one day I'll be able to play in that team. That dream has become a reality now, so I can't wait for that to get started.'
He is also looking forward to tasting the unique atmosphere of Anfield on a European night:
'Liverpool have got so much history and after the season they had last season, I can't wait to get started and carry on and build on that.
'Champions League football is back; everyone is telling me that the atmosphere on Tuesday and Wednesday evenings at Anfield are something special.'