Fifa referees’ chief Pierluigi Collina says there will be further trials of a challenge system as part of a two-year review of the video assistant referee (VAR).

The International Football Association Board (Ifab) announced the review at its annual general meeting on Saturday – the 10th anniversary of its initial approval of VAR trials.

Football Video Support (FVS), which allows coaches to make two challenges per match, is already being tried out in Italy, Malta and Spain.

Collina, who chairs the referees’ committee of world football’s governing body, said it was likely those trials would be replicated elsewhere.

“It is probable that in the next weeks we will open the possibility to join the trial for the next season to member association and competition organisers,” he said.

The very existence of VAR has been questioned at times this season in particular, with many claiming the game would be better without it.

Collina, who was voted the world’s best referee five times, said: “In Italy, we say that in every wonderful marriage, there is a crisis after seven years.

“So it might be possible that people fall in love with the VAR, and then after some years… crisis.”