Rafael Benitez has challenged Newcastle to rediscover their "character and passion" or face slipping to Premier League relegation with a whimper.
Comical defending and a limp, frozen performance from Newcastle gifted Southampton an easy 3-1 league win at St Mary's on Saturday.
Shane Long, Graziano Pelle and Victor Wanyama struck all too easily for Southampton, consigning Newcastle to a sixth defeat in a seven-match winless run.
Manager Benitez implored Newcastle's fuming fans to back his beleaguered side ahead of Saturday's critical home clash with Swansea, demanding a victory to keep the survival fight alive.
"Character and passion, and positive play - that's the very least of what is expected every game, for 90 minutes," said Benitez.
"But it is clear that that was very much lacking in the first half.
"That's not a situation that we can have away from home, so we have to make changes to how we'll play away from home.
"Before that we'll have to prepare for the next home game, and we just hope we can keep the fans behind us.
"It's very clear that we can say nothing to our fans.
"They come here to see the team fighting and winning and we didn't do that in the first half. So you have to understand their feelings.
"But we'll need support from the fans, we need them behind us to drive us on, to get a result against Swansea."
Goalkeeper Rob Elliot is out of both Newcastle's relegation fight and the Euro 2016 finals after being told he faces "a number of months" on the sidelines with a knee ligament injury.
The 29-year-old's worst fears were confirmed on Wednesday less than 24 hours after he damaged his anterior cruciate ligament in the act of making a save in the Republic of Ireland's 2-2 friendly draw with Slovakia at the Aviva Stadium.
An initial scan carried out in Dublin suggested the extent of the injury, but further tests back on Tyneside held no better news for Elliot.
A Newcastle statement said: "Newcastle United can confirm that goalkeeper Rob Elliot has sustained an injury to his anterior cruciate ligament, suffered during the Republic of Ireland's friendly fixture against Slovakia last night.
"Rob has returned to Newcastle and has been assessed this morning by the club's doctor. He will now commence a programme of treatment and rehabilitation.
"Regrettably, the severity of this injury will rule Rob out for a number of months. Everyone connected with Newcastle United wishes Rob the very best for his recovery."
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Former Newcastle United striker Shola Ameobi has signed for League One side Fleetwood Town until the end of the season.
Ameobi, 34, has made 298 appearances in the Premier League for both Newcastle United and Crystal Palace and turned down a number of clubs to join Steven Pressley's side.
Saido Berahino is set to stay at West Brom, with the Baggies unwilling to sell this month.
They rejected four bids from Spurs in the summer - which led to Berahino threatening to strike - but have not received any offers during the January window.
Tottenham's offers would have been paid in instalments, with their final bid rising to £23million, and their approach strained the relationship between the clubs, although any differences have since been patched up.
Albion chairman Jeremy Peace has been bullish in his stance over Berahino, with no club getting close to his valuation of the 22-year-old, and with just days left of the January transfer window it is understood the Baggies do not expect to receive an acceptable offer.
The England Under-21 international has scored four goals in 19 games this term - and has not started a match since October - after netting 20 times last season.