"I'm excited to be back on the MotoGP grid this weekend for the German GP," said the 34-year-old Michael, who has been a test rider for Aprilia.
"I have witnessed some great development work through the test team. I now look forward to being a part of the racing team."
The race at the Sachsenring is the ninth round of the championship.
(Reporting by Alan Baldwin in London, editing by Toby Davis)
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