It's been discussed many times on here. Under UK law, which the PL have to follow, there is a 6-year limitation period unless there's evidence of fraud.
It's quite possible that the IC have looked at the evidence and ruled out the possibility of fraud. That would almost certainly mean that only transactions in the 2016/17 and 2017/18 financial years could be considered. That would completely rule out the Mancini contract and the Fordham image rights stuff.
The only thing they could consider is 2 years of the Etihad sponsorship, and that's going nowhere.