Giroud is a freebie, for example. The things Higgy is useful to us for (aka what Ronaldo and Dybala cant/dont do), we can find someone whos A LOT cheaper.
And regarding his selling value, if we extend him for a year or two, his book value would go down further iirc, so there is that option as well
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He costs us more than 7M a year. WAY more