The International Football Association Board today decided trials with five match officials - with an extra assistant behind each goal-line - will continue for the next two years.

The system was used by UEFA for the Europa League last season and this may be extended to the Champions League next season. Meanwhile, all domestic leagues and FAs can now request to stage further trials from next season.

Jonathan Hall, the FA's director of football services, said he did not think either the Premier League or Football League would be keen, and that it would not be practical in the FA Cup as the system would have to be used in the early rounds as well.

Hall, speaking in Zurich following a meeting of the IFAB, said: "We probably don't have the required numbers to do it domestically and the Premier League and the Football League have never been hugely keen on introducing it.

"One reason is simply the number of officials of the relevant ability needed to provide the service and for those reasons we weren't very keen.

"The other is because of concerns over safety - if you are standing behind the goal on a permanent basis the you are more stationary and you may get something lobbed at you."

The FA Cup has been considered as a possible competition in which to experiment, but that looks unlikely too.

Hall added: "We had had a little think about whether we might do it in the FA Cup but what was made very clear is that you have to do it all the way through the competition and it's very difficult to see how you would do it for the very early rounds - that would be ridiculous.

"We'll go back and have an open conversation about it and at league level it looks unlikely unless they have changed their minds on it.

"We don't want to prevent others from doing it if they want to however."

The experiment, which is the idea of UEFA president Michel Platini, will not be used in the World Cup next month.

Platini insisted the Europa League trials had been a success, saying: "The referee sees a lot but with an extra four eyes you see more things and you help the referee to take a better decision."

FIFA general secretary Jerome Valcke added: "The positive aspect of the Europa League experiment were definitely shown.

"Extra additional referees will not be compulsory, but it's an option for the next two seasons.

"You cannot just do this test at a final, however. It has to be all through the competition and not limited to just a single match.

"If the FA Premier League decides to go with such a trial it has to be from the first game to the final game of the season."

Scottish FA president George Peat also suggested there would be no trials in Scotland.

Peat said: "We are not totally convinced by the experiment but happy to have a further trial.

"I don't think we will be doing it in Scotland but we will obviously discuss that."

The IFAB, made up of FIFA plus the home associations, approved an amendment proposed by the Scottish FA which formally allows the fourth official to assist the referee with events in the match.

There was also a ruling on feinting at penalty kicks - feinting in the run-up to confuse opponents is permitted, however feinting to kick the ball once the player has completed his run-up is now considered an infringement of Law 14 and an act of unsporting behaviour for which the player must be cautioned.