Nottingham Forest have contacted UEFA to raise concerns about Crystal Palace's participation in next season's Europa League, according to reports.
Nuno Espirito Santo's team have written to European football's governing body highlighting potential breaches of multi-club ownership regulations.
The issue centres on American businessman John Textor, who holds a 43 per cent stake in Crystal Palace whilst also being the majority owner of French club Lyon.
Both clubs have qualified for the Europa League following Palace's FA Cup triumph over Manchester City and Lyon's league position.
Nottingham Forest have contacted UEFA to raise concerns about Crystal Palace's participation in next season's Europa League
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Forest's intervention comes as they stand to benefit directly from any ruling against Palace, potentially earning promotion from the Conference League to take the South London club's Europa League place.
UEFA regulations prohibit clubs controlled by the same individual or entity from competing in the same European competition. Textor's ownership positions create a direct conflict under these rules.
The American businessman could have avoided this situation by placing his Palace shares into a blind trust, but the deadline for such arrangements passed on March 1.
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Crystal Palace qualified for the Europa League by winning the FA Cup
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Palace have already travelled to Switzerland to meet with UEFA officials, arguing that Textor holds no controlling influence at the club despite being their largest shareholder, reports the Times.
Should both clubs remain eligible, Lyon would take precedence over Palace due to their higher domestic league finish. This would see the Eagles excluded from the Europa League entirely.
Forest's potential elevation to the Europa League would come at Palace's expense if UEFA rules against the south London club.
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However, any decision to demote Palace to the Conference League would likely face a legal challenge from Brighton.
The Seagulls finished eighth in the Premier League and would be next in line for a European place. Either outcome could result in appeals to the Court of Arbitration for Sport from the affected parties.
Forest took preventative measures earlier in the season when it became clear both they and owner Evangelos Marinakis' other club Olympiacos could qualify for the Champions League, making the necessary ownership structure changes to comply with UEFA regulations.
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UEFA's Club Financial Control Body is expected to announce their decision by June 27, though a resolution could arrive earlier if Textor sells his Palace shares.
Senior figures at Crystal Palace remain confident they will reach an agreement with UEFA that allows their Europa League participation.
The ownership complications stem from Textor's long-standing desire to sell his Palace stake following a breakdown in relations with chairman Steve Parish. The 59-year-old has been seeking to offload his shares for some time.
Nottingham Forest owner Evangelos Marinakis took steps to ensure his side complied with Uefa rules
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Lyon's participation was previously in doubt after being disqualified by UEFA's Club Financial Control Body in December over financial difficulties that saw them provisionally relegated from Ligue 1.
However, they were permitted to continue in the Europa League after meeting certain demands.
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