Former Premier League referee David Elleray, who is now technical director for football's law-making body IFAB, has said plans are progressing well enough to be considered for the showpiece finals in 2018.
Early trials, held in Italy, Holland and the United States, will be discussed at next month's IFAB annual general meeting in London.
Elleray said: "We are very happy with the progress that has been made. We have gone from almost nothing to more than a dozen countries, and we have already found out what we can do better.
"One or two things did not go so well at first but it would be a great shame if people get the idea that it is not going to work.
"It has so far worked better than a lot of people have anticipated.
"If the trials go well, FIFA would like to have the option to use it for the World Cup next year. England are also following this closely and may well become part of it in the future."