Manchester City boss Pep Guardiola again backed the use of Video Assistant Referee (VAR) technology, but called for decisions using the system to be speeded up after his side's 7-0 thrashing of Schalke to progress to the Champions League quarter-finals on Tuesday.

Three of City's goals scored by Sergio Aguero, Leroy Sane and Raheem Sterling had to be checked by VAR for tight offside calls, while Sane also had another goal ruled out. But there was frustration among supporters over long delays before the referee was given the all clear by his video assistants to either award the goal or rule it out.