FA documents now show Fernandez has eight years left on his 180,000-a-week deal which runs until 2032, while Mudryk on his 97,000-a-week deal runs until 2031.
When the deals expire, Fernandez will be 31 and Mudryk will be 30.
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The FA released the data on Fernandez and Mudryk as part of their annual agent payments report last week.
For now, it is unclear why Chelsea chose to trigger the extension options of both players.