How much is Christopher Nkunku worth? A 27-year-old France international, he cost Chelsea £52 million when he joined the club last summer. Most would probably agree that he is still worth the same sort of money now.

The Blues are in Germany tonight looking to continue their fine Conference League campaign, taking on a team who could not be more different in stature. While Chelsea manager Enzo Maresca is just in his sixth month at the helm, Heidenheim boss Frank Schmidt has been in the role since 2007, a remarkable 17 years.