Mercedes has poached two engineers from 2013 World Champions Red Bull, according to the German newspaper Bild.
The report said vehicle dynamics chief Mark Ellis and simulation boss Giles Wood have both been poached by Mercedes.
Bild correspondent Nicola Pohl surmised: "Not a nice Christmas surprise for Sebastian Vettel."
She said both engineers are due to start work at Mercedes in June 2014.
The report said vehicle dynamics chief Mark Ellis and simulation boss Giles Wood have both been poached by Mercedes.
Bild correspondent Nicola Pohl surmised: "Not a nice Christmas surprise for Sebastian Vettel."
She said both engineers are due to start work at Mercedes in June 2014.