ContinueLiverpool have completed the signing of Swansea's Wales international midfielder Joe Allen, after pursuing him for much of the summer.
The 22-year-old was at Anfield on Thursday as Liverpool beat FC Gomel 3-0 in their Europa League qualifier and passed a medical on Friday.
He becomes Brendan Rodgers's second signing after the capture of Italy international striker Fabio Borini, who scored in the match on Thursday night.
"I feel incredible. Everyone knows the history of this club, it's a massive club, and I'm delighted to have joined," he told the club's website.
"The passion that people here have for football is something I share and I want to be part of that.
"I'm looking forward to being part of some great years ahead for Liverpool."
Rodgers believes Allen will play a key role in helping him impose his style of play on the Liverpool team, after working with him at their former club.
Allen was crucial to Rodgers's system at Swansea and expects the Welshman to do a similar job at Anfield.
"I'm absolutely delighted that Joe has made the decision to come with us on this journey," Rodgers told BBC Sport.
"Joe is a player whose profile will fit perfectly with the ideas of this group. His ability to control and dominate the ball is an important ingredient in our attempt to gain success on the field.
"Joe has had a fantastic education at Swansea City and will now begin the next chapter in his exciting career."
The two clubs opened negotiations over a deal for Allen last month, but the Reds had their opening bid rejected.
Rodgers offered about £12 million plus fellow midfielder Jonjo Shelvey on loan, but that deal was turned down by Swansea chairman Hugh Jenkins, meaning the final undisclosed fee is in the region of £15 million.
Although the new Liverpool manager has a written agreement with Swansea not to return to his former club to try to sign any of their players for the next 12 months, the Welsh club can waive that clause if a deal is deemed to be in the best interests of the club.
The Welsh wonder kid has just returned from international duty for Team GB in the Olympics, where his impressive performances helped Great Britain reach the quarter-final stage, before being knocked out on penalties by South Korea.
