World championship leader Rosberg and Mercedes DTM racer Pascal Wehrlein were taking part in promotional filming with German international stars Julian Draxler and Benedikt Howedes as passengers. 19-year-old Wherlein is understood to have struck two people who had made their way on to the circuit, which was made up of closed roads in northern Italy.
Rosberg was ahead of Wehrlein at the time and was not involved in the accident. Both racing drivers and footballers escaped without injury, while the two men struck by the car were taken to hospital with unconfirmed injuries.
"An accident occurred during a visit to the training camp of the German national football team,” said a Mercedes statement. “While driving on a closed circuit, DTM driver Pascal Wehrlein injured two people whom he unexpectedly encountered walking on the closed course.
"We cannot offer any statement concerning the severity of injuries, as both injured parties are currently undergoing medical treatment. Pascal Wehrlein was uninjured in the accident.
"We deeply regret this accident and send wishes of quick recovery to the injured. We will work in full co-operation with the authorities in determining the exact circumstances of the accident."
Rosberg later took to Twitter regarding the accident:
I am shocked by the accident. My thoughts are with the two people who were injured and I wish them a fast recovery— Nico Rosberg (@nico_rosberg) May 27, 2014