Bayern Munich are still waiting on Leon Goretzka and Javi Martinez to return negative coronavirus tests so they can resume first-team duties.

The midfield duo are set to be absent once again for Friday's Bundesliga match at Hertha Berlin after testing positive for COVID-19 last week.

Speaking at a pre-match news conference, head coach Hansi Flick confirmed Martinez's spell of self-isolation is set to end on Wednesday, with Goretzka having to wait until Friday.

After the Hertha game, European champions Bayern will fly to Qatar to commence their Club World Cup campaign.

"With Javi and Leon it is the case that we do a test after the quarantine, I can't comment on that because I don't have the results," he said.

"Javi has to take the test and then it will be determined if he still has the virus in his body. We have to wait from day to day.

"We also know with Leon that it takes a few days longer. He also has to be tested, everything will depend on that."

With or without Goretzka and Martinez, Flick conceded the Club World Cup will place an additional strain upon Bayern within an already condensed schedule.

"Qatar is very stressful, we have the flight and the games on Mondays and Thursdays. It was clear to us that we would not have time for proper training," he said.

"The team, coaching team and club want to win the next title, we all know that it is not easy.

"In addition to getting some vitamin D [sunshine], it is also a change from everyday life, even if the journey is dangerous.

"We want the sixth title in a year, the team would make history."

Flick had some words of encouragement for Niklas Sule, the defender who has only started two of Bayern's past six Bundesliga matches and was recently linked with a move to Chelsea.

"Niklas is an absolute option, whether in the centre or full-back position," he said of the Germany international, who suffered a ruptured anterior cruciate ligament last season.

"He did well at Schalke [last month's 4-0 win where Sule played at right-back]. Don't forget that he had a long injury.

"Niklas is a fast player who is serene on the ball and helps shape the game from behind. Given his size, he has absolute strength and I'm glad he's on our team.

"We will see how everything develops and how he sees his future. I am satisfied with his development, you can rely on him."