That's not how amortisation works.If Laporte is staying , I can't see Ake wanting to be 4th choice, Ake has already been here a year so we will have already had amortisation of his original fee.
We also have Sandler, a huge talent if he is over his injuries, he could be 4th choice.
He signed a 5 year deal so 1/5 of his fee will have been amortised(?) and 4/5 or 32m will still be left