Joachim Low has told injured Bayern Munich goalkeeper Manuel Neuer he will need to be playing to make it into Germany's World Cup squad, though he has been assured of a return before the season's conclusion.
Neuer has endured a difficult 12 months, having broken his foot three times and managed just three Bundesliga displays this term.
Bayern have been particularly careful managing Neuer's comeback, as they seek to avoid another recurrence of the injury.
He is in the final stages of his rehabilitation ahead of a potential April return, but any setbacks might prove costly for him as Low says he needs to be playing if he is to be involved in the World Cup.
"If a player plays no role in the preparation, it is difficult to nominate him," Low told reporters on Thursday ahead of Friday's friendly with Spain.
"When Manuel came to us on Tuesday, together with Andy Kopke [coach] and Dr. [Hans-Wilhelm] Muller-Wohlfahrt [we] had a long conversation with him. Manuel is absolutely on schedule. It is planned that he will still play at Bayern this season.
"The doctor has assured me that the condition of his scar and the growing together of the bones are absolutely fine and look very good.
"However, at the current stage he is not allowed to [train] at maximum, he is currently training at 90 per cent and wants to increase to 100 per cent this week so that he is fully resilient.
"Then he can still get the necessary security in the training sessions. I assume and am very optimistic that Manuel will be present at the World Cup."
Even if Neuer does suffer a setback and has to miss the tournament, Germany will be in good hands between the posts, as Barcelona's Marc Andre ter Stegen will be waiting to take his place.
And Low was full of praise for Ter Stegen, who he believes has matured in LaLiga.
"He has developed very, very well," Low added. "His first games in the national team were a bit mixed. But in the last few years he was very, very good. He played a major role in the Confederations Cup.
"He has grown up in Barcelona, he plays well. As a goalkeeper he is very, very calm, relaxed and focused.
"You can feel his charisma. He has gone through a maturing process at Barcelona. He has become a personality who has a very good standing with us in the team.
"One senses with him that he puts a very strong emphasis on the performance and that also shows continuously."
|Sarri wants new central midfielder and hints at Chelsea stay for Cahill|
|Nantes sign former Manchester United full-back Fabio|
|Marcelino rewarded with one-year Valencia extension|
|Warburton retires: Bale leads social media tributes to Welsh great|
|Mistakes do not define me, says Chelsea boss Sarri|
|Saints and Tigers to honour Horne with Twickenham clash|
|I want to keep Hazard, says Sarri|
|Europe must stop American juggernaut at Carnoustie|
|Joshua planning for heavyweight ´legacy´ – starting with Povetkin|
|Warburton retires: Wales and Lions star´s career in numbers|
|Matching ´ridiculous´ Tiger not on McIlroy´s radar|
|Spain sent me World Cup SOS, claims Benitez|
|Ozil, Gundogan critics should ´shut up´ - Klopp|
|McIlroy plans to play carefree at Carnoustie|
|Pakistan thrash Zimbabwe to secure series win|
|Warburton retires: Gatland salutes Wales and Lions great|
|Sturridge determined to stay at Liverpool|
|Mbappe is an alien – Varane|
|Warburton retires from rugby|
|India to assess Bhuvneshwar as Bumrah makes Test squad|
|Injured Craddock passes $100,000 in donations at Tour de France|
|WATCH: Perez taunts team-mate after audacious training goal|
|Alison Becker tweets ´I´m joining Liverpool´... but all is not as it seems|
|F1 Raceweek: Hamilton chasing down Schumacher - German GP in numbers|
|Notorious Carnoustie holds fond memories for legendary Watson|
|Rooney refused to be ´dead weight´ at Everton|
|The Open 2018: Molinari, Rahm and the in-form contenders at Carnoustie|
|Marsh interested in Australia leadership roles|
|United can challenge City for Premier League title, says Rooney|
|MLB All-Star 2018: Seven things you missed at Midsummer Classic|
|American League win home run-filled MLB All-Star game|
|Dragons lure Sims from Broncos|
|Cassano: Ronaldo like Nadal, Messi like Federer|
|Lakers´ Ball undergoes successful knee surgery|
|´We kill them, Messi or no Messi´ - Pogba´s pre-Argentina World Cup speech revealed|
|Cardinals suspend GM Keim for five weeks after DUI|
|Dalic: I can coach Brazil or Barca but Croatia my favourite|
|Warriors coach Kerr extends contract|
|I´m ready to bust him up - Miller calls out Joshua after New York confrontation|
|CAF Champions League Review: ES Tunis and TP Mazembe set the pace|
|Mixed day for seeds in Newport as Muller progresses|
|Rams sign Cooks to five-year extension|
|Cowboys’ Randy Gregory reinstated by NFL|
|Verdasco survives Swedish Open scare as Paire is picked off in Umag|
|US Open announces record prize fund for 2018|
|Stosur wins battle of former grand slam champions in Gstaad|
|Emery is Arsenal´s best signing, says Pires|
|Brewster commits to Liverpool with long-term deal|
|Panama boss Gomez steps down after World Cup|
|No Chelsea agreement for Golovin, claims CSKA president|
|Root looks right at home as England ease to series victory|
|Brighton sign Mali midfielder Bissouma from Lille|
|Kaka backs Brazil boss Tite after ´excellent´ World Cup|
|Alaphilippe the toast in France as Van Avermaet increases Tour lead|
|Shkupi 0 Rangers 0: Gerrard´s men advance despite dour draw|
|Khazri ends Sunderland nightmare as Saint Etienne swoop|
|The Open 2018 diary: Rose lets Rio go as Rahm goes ´Lefty´|
|Lampard raids Chelsea and Liverpool in Derby double swoop|
|Balotelli returns to Nice training after Marseille talks stall|
|Owens wants to play in the CFL, says agent|
|I don´t like thinking too much - Johnson|
|Toulon president fined as French club receive suspended points penalty|
|Top of the flops - Mickelson plays exquisite trick shot over man´s head!|
|Kerber targeted Wimbledon after 2017 disappointment|
|England´s World Cup heroes given dedicated parking spots|
|Insigne prefers Messi to new Juve star Ronaldo|
|Koepka enjoys playing with a chip on the shoulder|
|Ryan Hall to leave Leeds Rhinos amid reports of NRL move|
|Hamann slams Lahm for Low criticism|
|Hart named in Manchester City squad for United States tour|