FIFA is braced for legal challenges over the recommendation that player contracts should be extended until the pandemic-affected soccer season can be completed.

World football's governing body made the recommendation in a set of guidelines meant to tackle the complexities of the unprecedented shutdown caused by the coronavirus and help preserve the integrity and stability of domestic leagues.

Most major European leagues are still hoping to resume play at some point, pushing the domestic seasons well beyond their usual end point -- possibly even into August. However, many player contracts are set to expire on June 30, with some expecting to join a new club in July.

"You can appreciate the complexity of trying to give some guidelines globally," Victor Montagliani, the FIFA vice-president who leads the body's coronavirus task force, told The Associated Press. "We fully understand there could be individual circumstances in various legal jurisdictions that may arise to questions being asked or even some challenges.

"I guess it's no different than a system we already had that happens even before we had this COVID-19 issue where if there was any challenge, it would it would go through the proper football judicial bodies. ... We fully understand that that may happen again this time and we'll deal with that accordingly, whether it be at the national level, confederation level or even at the FIFA level."

Another complication is that sports lawyers do not view the guidelines from Zurich-based FIFA as binding for any player, club or league. And it's unclear what happens if clubs from different countries disagree on which rules should apply.

At Chelsea, for example, there is already a deal in place to sign winger Hakim Ziyech from Dutch club Ajax on July 1 while striker Olivier Giroud is out of contract on June 30. The Premier League season was scheduled to end in May but teams still have up to nine games to play once it resumes -- which may not happen until July.

"Under Swiss law -- as in most jurisdictions -- it is impossible for a club, a players' association or a league to unilaterally extend an individual contract of employment that expires on a specific date," attorney Despina Mavromati, who founded SportLegis Lausanne, told the AP.

"All contracting parties must reach an agreement and amend the contract accordingly. Further, if there is a new contract starting immediately after the expiration of the old contract, then all three parties (former club, new club and the player) must agree on the extension of the old contract and the modification of the starting date of the new contract."

Mavromati represents both clubs and players in cases and arbitrates at tribunals across multiple sports.

"Contractual extension cannot be regarded in the same way as, for example, the impossibility of a club to comply with the terms of the contract due to financial difficulties or other reasons," she said. "And, even if a case goes to FIFA and then to CAS, it will be extremely difficult -- if not impossible -- for a club to enforce a unilateral extension of a player's contract."

Belgium-based lawyer Sven Demeulemeester doesn't think FIFA's recommendations are legally enforceable because contracts fall under national law.

"At best, FIFA's guidelines may lead to subsequent individual negotiations or collective bargaining on a national level," Demeulemeester said, "but they have no legal value as such."