Teams playing in the Champions League and Europa League in 2018-19 will be able to field a fourth substitute in matches that go to extra time, UEFA has announced.
Following the successful implementation of the rule by FIFA at the World Cup, European football’s governing body updated its rules on replacements for various competitions.
The additional substitute will also be available to teams playing in the UEFA Super Cup, the Women’s Champions League, European Championship and European Women’s Championship.
The changes take effect immediately and also apply to other competitions, including the 2020 European Championship.
A fifth substitute will be allowed in next season’s Uefa Youth League, plus the men’s and women’s European Under-17 and Under-19 Championships.
Uefa says the hand-held electronic equipment can be used by coaches in the stands or on the bench if it directly relates to player welfare or safety, or for tactical/coaching reasons.
It means medical staff will be able to review potential concussions on laptops.
Officials and medics did not see a collision between Loris Karius and Real Madrid’s Sergio Ramos in the 2017-18 Champions League final, which may have led to the Liverpool keeper’s concussion.
In 2016, rugby union’s English Premiership became the first league in the world to allow access to tablets in order for staff to review potentially concerning incidents.