Chelsea's handling of keeper Thibaut Courtois's head injury in Sunday's win over Arsenal has been criticised by brain injury charity Headway. Headway chief executive Peter McCabe said it was "hard to understand how a concussion was not suspected".
Under Premier League rules introduced this season, players must leave the pitch after suffering a head injury.
Courtois was injured in the 10th minute at Stamford Bridge but, after being assessed on the pitch by Chelsea medical staff, continued until the 24th minute, when he was replaced by Petr Cech.
Television pictures appeared to show Belgium international Courtois bleeding from an ear as he was substituted.
"The new rules introduced this season were designed to ensure no risks to players' health were taken," McCabe said in a statement.
"They clearly state that, 'If there is any suspicion of the player having sustained a concussion, they must be removed from the field of play, and not allowed to return.'
"Bleeding from one or both ears is one of the symptoms that requires an immediate visit to hospital."
A Chelsea spokesman told BBC Sport: "Thibaut Courtois went to hospital during our game against Arsenal yesterday for precautionary tests on a head injury.
"Those tests came back all clear. He is expected to report for international duty later this week.?"
