Rugby Football Union chairman Andy Cosslett has backed Eddie Jones but said there are no guarantees the head coach will still be in charge of England for the 2019 World Cup.
Jones masterminded a record-equalling run of 18 consecutive Test victories after being appointed as Stuart Lancaster's successor.
But the Australian's position has come under scrutiny following five losses in a row, a sequence which was ended by a consolation victory over South Africa at Newlands last Saturday.
Cosslett praised the job Jones has done, but offered no assurances that he will still be at the helm for the showpiece in Japan next year after a 2-1 series loss to the Springboks.
"Things happen at the most inconvenient time - that's what life does. There is no time limit and you make decisions on the basis of the evidence or information you have at any given moment," said Cosslett.
"Hopefully we won't have to face that and we will have a run through to the World Cup.
"We have shown a lot of confidence in Eddie and we think he is still the man, but we will see where it goes to from here in terms of the next few months.
"You're asking for unconditional support but only my children get that. And even then not always!
"It's not something you give because you're under assessment the whole time. It's just not what we do."
He added: "Eddie has earned the right to make a strong case for the way ahead. We'll listen to his review of the tour and it will be fascinating to hear what he's got to say.
"Eddie came to our union when it was at its lowest ebb after the World Cup. He grabbed it and took us on this extraordinary run.
"He has tremendous credit at the union for what he's done. We're very grateful to him for what he did at the time when we needed it most. We've had a reversal, which now hopefully we've sprung out of it.
"The win in Cape Town was great, it was important and fantastic for the team, for the squad and everyone involved, but you have to keep a sense of proportion about this."
|Raptors GM apologises to DeRozan after Spurs trade|
|Manchester City 0 Borussia Dortmund 1: Gotze spoils Mahrez´s debut in ICC opener|
|United fans keeping De Gea at Old Trafford – Herrera|
|Keita: I turned down Barca and Bayern for Liverpool|
|Merritt stays ahead as rain halts Barbasol Championship|
|Roma had to sell Alisson to Liverpool, says Totti|
|Donald Trump: Kneeling players should be suspended without pay|
|Cardinals´ Carpenter makes history|
|Nationals pair Strasburg, Zimmerman activated from DL|
|Premier League-linked Plattenhardt feels at home at Hertha|
|Johnson expecting tough Granollers challenge|
|Good Luck at last! Colts quarterback fit for training camp|
|Haase humbles Rublev as Cecchinato charges on|
|Benzema hits back at ´crazy´ De Laurentiis over age jibe|
|Leeds Rhinos finally end winless streak in Super League|
|No freaky Friday for Spieth as he bounces back in round two|
|Double boost for Bouchard in Gstaad|
|Iconic Ronaldo to raise Serie A level - Roma´s Hamm|
|Brighton birthday boy March renews contract|
|Lamela hoping injuries are behind him after signing Tottenham extension|
|Where will I get my massage? - Roma´s Pallotta mocks UEFA ban|
|Rashid struck by Lightning amid speculation over Test recall|
|Major misses a mixed blessing for Fowler and Kuchar|
|Fleetwood, McIlroy and Spieth bare teeth as Kisner and Johnson lead|
|The Open 2018 diary: Fleetwood´s swinging in the rain, but it´s a slog for McIlroy|
|Fees agreed as Fabri closes in on Fulham move|
|Neymar and Mbappe have a very good relationship, claims PSG president|
|Boufal joins Celta Vigo on loan from Southampton|
|Leicester sign Ward from Liverpool amid Schmeichel speculation|
|Kisner philosophical after run-in with the Barry Burn|
|Gattuso unsure of Bonucci future|
|Verdasco, Gasquet advance but Ruud´s run is over in Bastad|
|James to remain at Bayern Munich, says Rummenigge|
|Texans QB Watson expects to be fit for training camp|
|Torpedo Moscow deny cancelling player´s contract over racist abuse|
|Napoli decry Cavani, Di Maria rumours as fake news|
|Kisner feels the Burn, Spieth on the surge|
|Woods: I could have cleaned up my round|
|Lille swoop for free agent Fonte|
|Sagan completes hat-trick after bunch sprint|
|´Amateur´ DFB needs Lahm´s help - Rummenigge|
|Horner expects Ricciardo new deal ´pretty quickly´|
|Diakhaby swaps Monaco for Huddersfield|
|Tottenham´s Lamela signs to 2022|
|Atletico´s Rodrigo excited to wear Simeone´s 14|
|F1 Raceweek: Red Bulls steal show from Mercedes but Ricciardo to start from back|
|Fakhar hits historic double hundred as Pakistan thrash Zimbabwe|
|Roma president Pallotta hit with three-month UEFA suspension|
|Hamburg extend contract of coveted youngster Jann-Fiete Arp|
|Steady start for Kisner as Woods endures mixed day at Carnoustie|
|Zach Johnson: Dustin comparisons are unfair|
|Neymar backs Tite for Brazil despite World Cup failure|
|Vinicius wants to play with ´idol´ Neymar but Perez calms transfer talk|
|One hundred not out for Els at The Open|
|Magnificent Maharaj takes eight wickets to stymie Sri Lanka|
|If I lose I´ll go down swinging - McIlroy ready for Carnoustie battle|
|UEFA confirms AC Milan reinstated to 2018-19 Europa League|
|Fleetwood: Open Championship is the one for me|
|Canberra coach Stuart brands bunker ´waste of time´ after controversial Cronulla loss|
|Son signs five-year Tottenham extension|
|Fleetwood cards fine 65 to share Open lead|
|WATCH: Evra belts out Bocelli in Ronaldo welcome video|
|I´ll always carry Roma in my heart, says Liverpool signing Alisson|
|CAS overturns AC Milan´s Europa League ban|
|McIlroy and Johnson on the move as Woods troubles Carnoustie spectators|
|Caleta-Car race won by Marseille|
|Hurricanes hold off Chiefs to reach final four|
|Bairstow: Unfair to compare England Test and ODI teams|
|Criticism is a weapon of the weak – Dani Alves defends Neymar|
|Thomas drops shot as McIlroy endures testing morning|