And a temporary move to the south of the country is a worrying sign for the playmaker, according to Redknapp.
He has scored just once in 19 EPL appearances for Liverpool, but that does not tell the whole story as far as his quality in the final third is concerned. It is for that reason that they refused to let Neco Williams go out on loan. "But his form hasn't been good and he hasn't looked good enough, to be fair, at the moment".
Minamino has gone to Southampton to get more games, and this gives the Saints more of an incentive to play him, and even if he doesn't manage to play a lot, Liverpool will benefit as they'll receive a financial windfall.
"I am very pleased to welcome Takumi to our squad for the rest of this season", Southampton manager Ralph Hasenhuttl said in club statement issued two hours after the 2300 GMT deadline.
"So he is there for 17 games now I think, in the situation Southampton are in if Takumi stays fit he has a good chance to play 17 games, which helps everybody".
"This will give us some additional depth in our squad at an important time".
Earlier in the day, the Reds completed their shock £2million deal for Preston centre-back Ben Davies with Jurgen Klopp needing cover in defence following long-term injuries to Virgil van Dijk and Joe Gomez.
Minamino replaces Shane Long, who moved to Championship side Bournemouth in another late move on a fairly quiet deadline day.