Spurs have hired Mourinho. He doesn't really do up & coming. Look at the signings this summer, solid professionals, so don't expect to be dazzled by Spurs next season either.
Can't see Utd signing Upamecano this summer unless they offer silly money. He had an release clause in his contract that allowed him to leave easier this summer for €60M. However, no-one looked like activating it, so he extended his contract by a couple of years with the proviso they give him a realistic release clause next summer, rumoured to be €42M.