Jimenez-Luiz clash raises calls for concussion substitutes 0 1 30 Nov 2020 20:38 Timesofindia.indiatimes.com (sports) A sickening clash of heads between Wolverhampton Wanderers' Raul Jimenez and Arsenal defender David Luiz which left the Mexican striker with a fractured skull has prompted calls for clubs to be able to make "concussion substitutions".