Keeping free trade with the European Union must be the priority for the upcoming Brexit negotiations, the chief executive of Ford told CNBC.

"What's really important to us is a stable trade environment between obviously the U.K. and the EU and that's our big priority, because we want to continue to build a profitable business and also secure a stable future for our over 14000 employees that we do have in the U.K," Mark Fields, president and CEO at Ford Motor Company, said.

The U.S. carmaking giant is one of the best examples of how firms based in the U.K. could be impacted from Britain's departure from the EU. Ford's factory in Dagenham supplies diesel engines to the rest of Europe and any hurdles to such supply could affect the business across the member-bloc.

"We are obviously monitoring the environment and the developments so we can factor that in our scenarios and at the same time we're being very forward in going to the various governments in the UK and the EU…about what our priorities are and what the impacts this could mean to the economy," Fields added.