"For instance, in 2006, the International Football Association Board (The IFAB) adapted the Laws of the Game to punish incidents which cause concussion such as an elbow to the head with a red card. This led to a significant decrease in such incidents and head injuries.

"For FIFA competitions, all team doctors are fully informed about these recommendations. It is the responsibility of each team doctor and any support staff in their team to decide whether or not a player can continue playing."

The organization is running a pilot in the Swiss first division this season to better monitor players' cognitive abilities and to help with swift diagnosis of brain injuries.

It will be supervised by FIFA's chief medical officer professor Jiri Dvorak, who told the newsletter: "In parallel with this research, we must -- sooner rather than later -- also discuss an additional substitution.

"That would give coaches greater personal leeway, as they could react more quickly and decisively in the case of injury."

The English Premier League announced prior to the start of the new season it had introduced new regulations regarding head injuries.

It said the final rulings on head injuries would be made by the medical professionals present and insisted a new "tunnel doctor" attended each match to assist the doctors already attached to the competing teams.