Manchester City are facing 115 charges of Financial Fair Play dating from 2009 to 2018 with the hearing getting underway on Monday.
A decision is expected after several months, though it could take longer to decide on a punishment if City are found guilty.
One of the sternest punishments possible includes relegation, though this is seen as extreme, as well as points deductions and fines as other possible penalties.
Among the many charges include City accused of funnelling money through sponsors in the United Arab Emirates that actually came from the club's owners.
Manchester City have always maintained their innocence
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City have always denied any wrongdoing and have already spent millions on the best lawyers around to fight their case at an independent inquiry.
La Liga president Javier Tebas has claimed to have some inside knowledge on what City's rivals think on the case.
"I have spoken with many Premier League clubs and most of them understand that City should be sanctioned," he told Spanish publication Mundo Deportivo.
The Premier League have already taken action against clubs for breaking Profit and Sustainability Rules, hitting Everton with two separate points deductions.
Nottingham Forest and Leicester have also had to fight their cases while Chelsea are awaiting potential punishment after admitting rules were broken under Roman Abramovich's regime.
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And Tebas has praised the Premier League for getting its house in order after the division's signifcant amount of spending compared to Europe's other football leagues.
"They have an economic dumping that was damaging to Spanish football," he added.
"We could not do the same because we would return to 2010, when clubs disappeared due to debts."
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Manchester City could be relegated if they are found guilty
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As well as sponsorship accusations, City have been charged with not fully disclosing their finances to a manager over a four-year period.
It is suggested that one of the managers was paid a lot more than what was officially stated.
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Over the nine seasons that the Premier League have accused City of breaking the rules, they won the title three times.
Whether they have their silverware stripped if found guilty remains to be seen while it might not be until next year, possibly as late as the early summer, before a decision is made.
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