The Daily Star says the Brazilian veteran has a clause that guarantees him a 25 per cent salary increase if United return to the Champions League.
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And victory in the Europa League final would see handed a place in the elite competition next season.
That would see Casemiro's salary next term jump to a stunning £500,000-a-WEEK.
Casemiro, now 33, agreed to the terms when first signing for United three years ago from Real Madrid.