I think my dog can rival your level of reading comprehension.
No one said he was knackered last season, I he's going to be knackered this coming season after an insane workload in 17/18 followed no break. So "he finished the season like all other players" is completely meaningless.
Why will we sign another player then? Given you've already decided Fernandinho will start every single game next season at his very best, and not show any signs of fatigue or ageing. Why did Pep want to buy Jorginho for £60m given he obviously was not needed and was never going to play?
Have you got a crystal ball?
Why will he be knackered?
He will be as fit as anyone.
A DFM was always on the cards this season, regardless if *you think Fern is knackered or not*.