wanderer paul
https://brentfordfcmemorabilia.wordpress.com/
The news has just announced that an extra substitution would be allowed for a concussion 'injury' starting in January 2021, the FA Cup weekend. This would be in addition to the usual substitutions already allowed.
www.skysports.com
A recent story on concussion in football: Jan Vertonghen: Former Tottenham defender played with concussion symptoms for nine months

IFAB Q&A: Football lawmakers expected to approve use of concussion substitutes
Concussion substitutes biggest issue on agenda for IFAB's Annual Business Meeting on Wednesday; IFAB expected to formally approve trials of concussion substitutes from January; Five substitutes, offside and Video Assistant Referees (VARs) also on the agenda
A recent story on concussion in football: Jan Vertonghen: Former Tottenham defender played with concussion symptoms for nine months