Professional Footballers Association chief executive Brendan Schwab says a survey of members resulted in just five per cent questioning the level of the cap, rather than the capping structure itself.

While the rugby codes threaten to become tangled in a legal quagmire regarding the Sonny Bill Williams saga, Schwab believes the rules within football are pretty clear.

He told au.fourfourtwo.com: “If any A-League player came to us and said they were planning to just leave their club then we would advise them very strongly not to do it.

“We would hope players would seek advice when starting out on the contract process. Clearly both the player and the club have to respect the contract they agree on.

"There are clauses that can be agreed which allow a player to move on during that deal and for a club to seek compensation should a fee or club from another country make an offer, for example.

“Let’s say an A-League player just walked out and went overseas to, say, France , FIFA’s regulations are such that any such move would not see a player able to just play for a French team.

"Firstly, Football Federation Australia would have to grant an international transfer certificate. In that scenario they would be in breach of FIFA regulations by doing so.

“So there is a structure in place within world football which seeks to protect the player and the club.”

As for ripping up the salary cap structure in the A-League, Schwab doesn’t see that happening.

He said: “There is a salary cap which we (the PFA) fully support. We have surveyed the players on this and there was overwhelming support.

“We had a seventy-two per cent response and of those who took part five per cent didn’t feel it was high enough. That’s a pretty small percentage.”