If it was done to reduce taxes then it’s a criminal matter and the then Directors should be worried. I’ve not seen any suggestion that there is a Police investigation although if the there is or was it would delay any PL investigation.
Highly unlikely the Police would be investigating the allegations which seem to be that RA through his non Uk business personally made payments to individual's who I believe were in the main non Uk citizens most if not all of the individuals seem to be self employed so the declaration of the income would almost certainly fall to those individuals make the appropriate declarations and payments to their countries tax authorities .
The irony is had it gone through the clubs books then almost certainly HMRC would be bought into the debate but the fact that it appears these payments didn’t .
That said there would be an issue if it turns out that RA paid direct to agents sums that were the players responsibility. There is an allegation around Hazards agent . These payments could be deemed to be a benefit I kind and if that’s the case would need to be accounted for and tax / nic paid as Brighton did in their recent case
Funnily one of the allegations is that RA personally engaged a team of solicitors to examine the FFP & PS regulations and explore the whole question of their legality. The suggestion is that as Chelsea could / would benefit from this legal work it should be paid for and accounted by the club.
One very last point on this is a significant flaw in the PL&FA