Bayern Munich duo David Alaba and Rafinha suffered injuries during Friday's 3-2 friendly defeat to Napoli.
Alaba, 20, is expected to miss six to eight weeks after suffering a stress fracture, though he will undergo further tests on Monday. Full-back Rafinha, meanwhile, tore ankle ligaments and is likely to be out for four to five weeks.
The pair have not been included in the squad for the trip to China on Sunday, while coach Jupp Heynckes said Germany duo Philipp Lahm and Bastian Schweinsteiger will also remain at home to focus on "building up their fitness".
Despite the setbacks, Heynckes was drawing the positives from the Napoli friendly.
"I was pleased with the performance of my team over long stretches," he said. "It was a more valuable and good test which provided more information than if we had beaten a team 11-0."
Alaba and Xherdan Shaqiri scored for Bayern.
