in 2-3 years time Mandžukič will probably be contributing nothing and we will sell him for nothing. with that said, Im not sure either we should sell for 20m. For 35 though I would
Let me put it this way
Currently, we are too thin on offensive options behind the 4 starters.
Replacing Mandzukic, who can play all year, with sanchez, who'll decline as he'll get exhausted mentally and the gain is small
If we cant afford Sanchez without a meager 20sale, we cant afford Sanchez.
If we cant afford Sanchez, we should get a different player we can buy without selling Mandzukic.
Like this, we'll greatly increase out depth. Which basically has been our prime strategy all the way and got us here.
Buy the star if you can afford him, or go depth
When you are forced to sell big, replace by big.
This isnt FIFA where you sell everyone except 14 players to get Ronaldo.