BOLTON are claiming to be owed money by Barcelona, according to reports.
Cash-strapped Barca shuffled their finances last summer in order to bolster boss Xavi's squad.
Marcos Alonso was one of their recruits, but the nature of the Spaniard's transfer from Chelsea has now been questioned.
Spanish paper AS claimed last month that the transfer had been reported to Fifa for alleged fraud by Alonso's former youth team Union Aldarve.
And according to Mundo Deportivo, Bolton feel they are due a payment too.
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Alonso, 32, played for the Trotters between 2010 and 2013 after signing from Barca's fierce rivals Real Madrid.
He subsequently signed for Fiorentina, spending three years in Serie A before signing for Chelsea under Antonio Conte in 2016.
His six years at Stamford Bridge came to an end last summer, when he left the Blues to return to LaLiga with Barcelona.
After being heavily linked with the Catalan side through the transfer window, Alonso moved to Barca on September 2 after having his Chelsea contract ended by mutual consent.
It was initially reported that Alonso had been due to be part of the deal that took Pierre-Emerick Aubameyang from Barcelona to Chelsea.
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But after it emerged that Barca did not have time to register the left-back on deadline day he was released by Chelsea instead - allowing him to move clubs outside of the transfer window.
Bolton, as well as Union Aldarve, have reportedly questioned the true nature of the transfer - although it is unclear what their exact grievance is.
Sports lawyer Jorge Vaquero claimed to Mundo Deportivo that, should a club be found guilty of "concealing data regarding a transfer", a ban from signing players could be enforced by Fifa.
Alonso has made 27 appearances for Barca this season.
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Xavi's men sit atop LaLiga - leading rivals Real Madrid by 12 points after beating them 2-1 before the international break.
