Miroslav Klose became Germany's record goalscorer in a comfortable win against Armenia, but forward Marco Reus is an injury doubt for the World Cup.
Klose, 35, came off the bench to head in his 69th international goal as Joachim Low's side found some rampant form in the final 20 minutes.
But there will be concern over Reus, who was in tears as he left the pitch and was sent to hospital for a scan.
Armenia were level with 20 minutes to go before Germany hit lethal form.
A goalless first-half ended with Borussia Dortmund forward Reus going over an ankle and being replaced by Arsenal's Lukas Podolski.
Coach Joachim Low told German television: "He is being examined as we speak in hospital and we will wait and see what comes out of it.
"A lot goes through your head at that moment and you just hope it is not too bad but then you see it swell up a bit. I hope the ligaments hold up.
"Until 24 hours before the first World Cup game, according to the rules, we can nominate someone else."
Podolski made the opener for Chelsea's Andre Schurrle early in the second half, Schurrle flicking in with a delightful backheel at the near post.