Arsenal manager Mikel Arteta has thrown his support behind the idea of having an extra concussion substitute as a temporary replacement when players with head injuries are being assessed by doctors off the pitch.
Arsenal defender David Luiz will miss Friday's (AEDT) Europa League game against Rapid Vienna as he continues to recover from an injury sustained after clashing heads with Wolverhampton Wanderers striker Raul Jimenez on Sunday.
Jimenez was taken off the pitch on a stretcher and later underwent an operation on a fractured skull.
Play restarted 10 minutes later and Luiz was allowed to continue playing with his head bandaged before being substituted at halftime.
"You need an extra two minutes or five minutes to check someone, maybe we can think about that," said the Spaniard, when asked about the possibility of having temporary concussion replacements.
"After five minutes you need to make a decision to find a sub.
"The player wants to carry on playing and the doctor has to tick all the necessary boxes to be certain that the player is okay to continue.
"If we have any extra doubt, we give them a bit more time if necessary but you cannot play as well 10 or 15 minutes with 10 men in football."
Arsenal were widely criticised for allowing Luiz to play on but the club defended the decision, saying "protocols were completed" with the player showing no signs of concussion.
Arteta added that Luiz could return for Sunday's north London derby against league leaders Tottenham Hotspur if he was comfortable heading the ball.
Arsenal said the cut to the Brazilian defender's head will "take some days to heal".
"Close care of David's cut and general monitoring of his wellbeing will continue in the coming days and David continues to be in good health," Arsenal said in a statement.