Arsenal manager Mikel Arteta says concussion substitutions in football should be considered.
The Gunners' Brazil defender David Luiz will miss Thursday's Europa League game against Rapid Vienna as he continues to recover from a clash of heads with Wolves striker Raul Jimenez on Sunday.
Arsenal were criticised for allowing him to play on for about 40 minutes, before he was substituted at half-time.
Arteta said he could play in Sunday's north London derby at Tottenham.
"Maybe it's a moment we can think: give these people a little more time and use a temporary substitution," said the Spaniard.