I believe around 25m is his value left on books. So if we could get a offer around that I think club would accept in an instance.
His amortization is around 10.7M per year, assuming he was bought for 80M, a little less than 11.5M per year if the maximum valuation (86M, all bonuses to Ajax were paid) was paid.
At most, 17.2M remaining in January.
25M is also the amount I expect for him. If he signs for 5 years in another club, it will be just 5M in amortization for them. It will allow him to demand a big contract, similar to what he could ask as free agent. Will get a good deal elsewhere, and allow the club to get a bit of profit.
A lot will depend on how the season play out though. If Pedri remains healthy, he will be mostly a bench player and it should force him out