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."
|Madrid bench Benzema and Bale as James starts for Bayern|
|NFL Draft 2018: Teams with most riding on draft|
|Salah used to have problems in front of goal, says former Basel team-mate Sommer|
|Oxlade-Chamberlain ruled out of World Cup|
|Arsenal´s Bellerin slams Daily Mail as ´click baiters´|
|Rodgers and Paul to take NFL-NBA battle to the golf course|
|Gurley, Elliott & Fournette - The top-10 running backs of the last 10 years|
|I truly could have shot 59 - Spieth reflects on Augusta charge|
|Bruno Mars, Britney Spears to perform at US GP|
|Mourinho suggests United were ´not prepared to win´ before his arrival|
|Wolves in the clear over Mendes link-up|
|Salzburg first, history later for Garcia and Marseille|
|Nadal overcomes plucky Carballes Baena to make more clay history|
|Tennis´ governing bodies acknowledge ´vulnerabilities´ after independent integrity review|
|Leeds owner defends controversial Myanmar tour|
|ICC apologises, launches investigation into controversial tweet|
|Moeen: England should have dropped me sooner|
|Henderson: Injured fan´s recovery is the only result that matters|
|Ronaldo sends signed shirt to Manchester United star Rashford|
|Independent review says tennis faces ´serious integrity problem´ with betting|
|Djokovic stunned by Klizan in Barcelona|
|This group deserves something special – Wenger wants to exit on a high|
|North to return to Wales with Ospreys|
|Vieira ´ready for Europe´ amid reported Arsenal interest|
|Wenger focused on Arsenal despite desire to keep working elsewhere|
|Mourinho has made me a better person, says McTominay|
|Gerard sacked as Barca B coach after woeful winless run|
|Sensational Storm demolish Warriors, Dragons win again|
|Bayern links ´an honour´ for Madrid man Bale|
|F1 Raceweek: Vettel closing in on milestone - Azerbaijan GP in numbers|
|It is wide open - Wozniacki hopeful over Roland Garros chances|
|Roma ashamed by Liverpool fan attack|
|Wade, Ginobili will not be rushed over retirement decisions|
|UEFA ´shocked by vile attack´ on Liverpool fan|
|Mayfield´s Big 12 dominance & Jackson the dual threat - The 2018 Quarterback class in Opta numbers|
|Campbell tips Vieira and Bergkamp to replace Wenger|
|Courtois to sue former Belgium coach Wilmots|
|Heavyweights Ronaldo and Lewandowski go head to head – Champions League in Opta numbers|
|Spurs, Heat eliminated as Celtics go up 3-2|
|Angels overcome Ohtani´s so-so outing to win series over Astros|
|Red Bull want Ricciardo decision by August|
|Rangers injuries piling up as Beltre leaves with hamstring issue|
|A´s closer Treinen exits after being hit by comebacker|
|Copa Libertadores Review: Gabriel leads Santos, Atletico cruise|
|He decides the biggest moments – Wijnaldum hails Salah|
|Finau ready to compete after freak ankle injury at Masters|
|Roma have some hope, says Monchi|
|Westbrook fined $10,000 for altercation with Gobert|
|Messi? Ronaldo? Salah is world´s best player – Gerrard|
|Liverpool are not Barcelona – Klopp cautious of Roma comeback|
|Liverpool supporter in ´critical condition´ after fan clashes|
|Gronkowski commits to 2018 season with Patriots|
|F1 Raceweek: Title race to heat up at venue of Vettel-Hamilton flashpoint|
|It´s all-inclusive football with Liverpool! - Klopp pleased despite Roma recovery|
|Montella to remain Sevilla coach until end of season|
|Di Francesco: Roma gave up – but if you don´t believe in a comeback, stay at home|
|Klopp accepts Salah substitution sparked Roma fightback|
|Oxlade-Chamberlain may miss World Cup after suffering ´a really bad injury´|
|De Rossi blames long balls for Roma ´blackout´ at Anfield|
|Trump happy to fly under the radar at World Championship|
|Late Liverpool lapses sour stunning Salah show|
|Henderson wary of Barcelona repeat as Roma leave Liverpool with hope|
|Championship Review: Cardiff slip up as Barnsley stay in the relegation zone|
|Goffin lives dangerously in Barcelona|
|Liverpool 5 Roma 2: Salah shines but late comeback offers Giallorossi hope|
|Salah sets Liverpool record with spectacular first-half double|
|Six first-round quarterbacks & two top-10 trades - 2018 NFL Mock Draft|
|Oxlade-Chamberlain carried off in Champions League semi-final|
|Indians equal lowest total in defeat to Sunrisers|
|Selby final frustration contributed to ´beginning of the end´ comment - Higgins|