The Wales international signed a long-term contract after passing a medical at Melwood.
After finalising the deal, Allen told Liverpoolfc.com: "I feel incredible. Everyone knows the history of this club, it's a massive club, and I'm delighted to have joined.
"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 Football Club."
The 22-year-old becomes our second summer signing following the arrival of Fabio Borini.
Brendan Rodgers said: "I'm absolutely delighted that Joe has made the decision to come with us on this journey.
"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, and I wish him all the very best in what I'm sure will be a long and distinguished career here at Liverpool."
http://www.liverpoolfc.com/news/latest-news/allen-completes-liverpool-move
Welcome to Anfield Joe 
jcallen29Fri 10/08/12 at 19:39 Glad this is a done deal. Welcome Joe 
LFC SUBFri 10/08/12 at 20:38 Welcome Joe hope he can be a great player for us. I imagine he will play along side lucas with gerrard in front. Is that the end of Adam, spearing or shelved? One will go surely.
ArtonSG8Fri 10/08/12 at 20:58 Welcome Allen! Prove yourself and make those 15m pounds worth.
NichoFri 10/08/12 at 21:00 Welcome Joe hope he can be a great player for us. I imagine he will play along side lucas with gerrard in front. Is that the end of Adam, spearing or shelved? One will go surely.
Freudian typo lets hope not in the case of Shelvey
BadmoonFri 10/08/12 at 21:16 Excellent signing was very impressed with him in the Olympics - great on the ball and excellent control and a bit of pace and passing, alonso and mash crossed - you can only hope. I expect big things to out play because of him and thats why he has paid the money - spearing is gone surely and adam
NichoFri 10/08/12 at 21:19 Good luck Joe. i hope it goes well
KK73Sat 11/08/12 at 01:50 Finally, but all good things come to those that wait! Our midfield look sorted.
AL___AAHILSat 11/08/12 at 02:51 I think our midfield was already fine and i think others areas need more attention.  Not too sure about Allen but best of luck to him. Stats are on his side and I hope he can replicate it with us.
KK73Sat 11/08/12 at 02:59 Hopefully we will now start work on the other areas higher up the field. But this was a signing that was always going to happen. I think this guy is going to be really good. Had a good season last season and played well in the olympics still very young.
solodeeSat 11/08/12 at 06:50 Welcome to Anfield. No one said it would be easy!
OlivavuSat 11/08/12 at 10:51 I am pleased about this. Hopefully it means Charlie Adam is off.
EddieCSat 11/08/12 at 10:52 I think it will do mate 
Ian The RedSat 11/08/12 at 10:57 I'm glad we didn't end up paying the £20m that was mentioned, but £15m is still a bit steep. He's a good player though, and I'm excited to see him in action.
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