The Spanish goalkeeper is racing against time to be cleared after a nasty head collision during Monday’s 3-1 defeat to Nottingham Forest.
He was forced off in the 66th minute following a clash with Morgan Gibbs-White, who suffered a facial injury in the incident. Sanchez initially tried to continue with heavy head bandaging, but Chelsea staff eventually replaced him with Filip Jorgensen.
Although neither player was officially recorded as a concussion substitution, Sanchez must still undergo strict medical assessments under FA return-to-play protocols.
Chelsea’s medical team at Cobham will monitor him closely over the coming days, with repeated checks required before any clearance can be given.
The guidelines prioritise player safety and any failed stage could trigger a mandatory rest period of at least 12 days. With limited recovery time before Saturday’s clash, his availability remains uncertain.