Football and frozen food collided on social media following England's 1-2 defeat to Iceland in the last 16.
The 24-year-old becomes the fifth player to move to Anfield from Saints in two years.
Alexis Sanchez has been in brilliant form in Copa America, scoring three goals and assisting two.
Brazilian also expressed faith that Paul Pogba will shun overtures from Manchester United.
Messi's decision follows a missed penalty in the Copa America final shootout against Chile.
The former captain has blasted Roy Hodgson and his squad for their insipid display in Nice.
Former Liverpool defender brands Three Lions squad 'average' after shock defeat.
Defeat to Iceland in the last 16 casts shadow over the state of a directionless national game.
Gary Neville has had one stint as a manager at Valencia that ended with him being sacked.
IBTimes UK looks at the possible candidates for the Three Lions after their shock exit.
The captain has dismissed the idea he will walk away from the world stage after the loss in Nice.
Gabriel Barbosa has confirmed interest from top European clubs.
Dortmund CEO Hans-Joachim Watzke has already accepted defeat in retaining Henrikh Mkhitaryan.
Zlatan Ibrahimovic has retired from international football after the Euros.
England have been knocked out of the Euro 2016 following their 2-1 defeat to Iceland.
Gareth Southgate, Alan Pardew and Eddie Howe lead the pack as bookie favourites.
Roy Hodgson's side were eliminated after a dismal night in Nice.
The 68-year-old announced his departure after Monday's 2-1 defeat.
Three Lions eliminated as Iceland march on to meet France in quarter-final.
Brazilian becomes the Italian's second signing of the summer following the arrival of Miralem Pjanic.
Spurs officials are expected to iron out a deal with the 20-year-old striker this week.
Manchester City star admits international career in the balance after Chile penalty debacle.
The 24-year-old Senegal international is reported to have also attracted attention from Bayern Munich and Arsenal.
The 27-year-old has reportedly emerged as a transfer target for Jose Mourinho.
Barcelona star vowed never to play for his country again after Copa America final loss.
The 23-year-old Frenchman is among the most sought-after players in Europe.
Antonio Conte's side produce a tactical masterclass in Saint-Denis to send reigning champions packing.
Kevin Gameiro, Mauricio Lemos and Luciano Vietto are all possible candidates.
Chelsea, Manchester United and Arsenal are linked with a move for the Spanish striker.
Granit Xhaka missed a penalty for Switzerland which eliminated them from the tournament.