Sauber have confirmed that Head of Track Engineering Tom McCullough is set to leave the team early next season.
McCullough joined Sauber ahead of the 2013 Championship after 10 years with rival outfit Williams F1.
However, after just one season with Sauber he is set to walk away by the end of February 2014.
According to GPUpdate.net, the 38-year-old is said to be "returning home to join a British-based team."
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