“Honestly there is always a plan A, plan B, plan C and plan D,” Keller told a Sky television programme broadcast Sunday.

Loew will end his 15-year reign as national coach, a spell which included the World Cup win in 2014, after Euro 2020 this summer.

His former assistant and current Bayern Munich coach Hansi Flick, Ralf Rangnick, who just turned down a potential return to Schalke, Germany under-21 coach Stefan Kuntz and present assistant Marcus Sorg have all been linked to the job.

“I’m convinced that we will be able to present an amazing coach in the coming months,” said Keller.

Liverpool manager Juergen Klopp says he is unavailable but Flick also has a contract to 2023 – and having delivered the treble last season remains a crucial aspect of Bayern’s plans.

“I told him that we are very satisfied with him,” Bayern chairman Karl-Heinz Rummenigge told the Welt am Sonntag paper in regard to Flick’s future.

“We are well advised to finish what we have agreed in the contract. I told Hansi that in no uncertain terms.”

Rummenigge went so far as to suggest 1990 World Cup winning captain Lothar Matthaeus as a potential successor to Loew.

“Lothar is an absolute expert and he has had a great development, particularly in the last five, six, seven years,” he told a Sky programme celebrating Matthaeus’ 60th birthday. “He was a coach, he has experience.

“I think everyone would trust him. Not just (German legend) Franz Beckenbauer, who has already done that publicly.”