Chelsea have made a move for £21 million-rated Arsenal target Ricardo Rodriguez ahead of a potential January move, according to The Sun.
The Gunners have been tracking the Switzerland international for some time but Antonio Conte's side have stolen a march on their London rivals in the chase for his services.
Chelsea are looking to add to their defensive options as quickly as possible, having missed out on a number of targets in the summer, as they prepare for the second half of this season's title challenge.