Minamino arrived at Anfield from Salzburg in the January transfer window in 2020, and has gone on to make 31 appearances for the Reds so far.
The 26-year-old was surprisingly overlooked in the seven league games following his first goal in the English top flight, going unused in six and playing six minutes in the other after scoring in the 7-0 thrashing of Crystal Palace.
Liverpool confirmed the deal late into deadline day, with the versatile forward linking up with Ralph Hasenhuttl at St Mary’s.
The switch deprives the Reds of a useful attacking option for the rest of the campaign, but gives Minamino the opportunity to prove himself in the Premier League with chances limited on Merseyside.
It is unclear whether Jurgen Klopp sees Minamino returning to his first-team squad in the future, but departing on loan just over a year after joining does not bode well.
More likely is that Minamino will boost interest with his performances on the south coast, ahead of a possible permanent exit in the summer.
Good luck, Taki!