Anderlecht have been one of 11 leading clubs from Europe's smaller nations trying to set up a "Euroleague", with teams from the Netherlands, Portugal, Scotland and Denmark, as a counter to the lucrative Champions League.
The clubs, keen to share some of the money pouring into the game's bigger competitions, have twice had their overtures to governing body UEFA turned down.
Writing on the club's website, Anderlecht manager Michel Verscheuren said the Brussels side had been invited to join the G14. "We didn't officially put ourselves up for candidacy.
"For years, UEFA has dominated European football. It's only normal that football clubs of a certain level seek closer ties with each other.
"That doesn't mean we are disloyal to UEFA," he added.
The G14 currently consists of Real Madrid and Barcelona of Spain, Bayern Munich and Borussia Dortmund from Germany, England's Manchester United and Liverpool, Dutch sides Ajax Amsterdam and PSV Eindhoven, Inter Milan, AC Milan and Juventus from Italy's Serie A, Porto of Portugal and French clubs PSG and Olympique Marseille.
Reuters
Belgian champions Anderlecht has said they had been invited to join the so-called G14 lobby group that unites some of Europe's premier soccer clubs.
