Ajax have reportedly decided that they will demand at least £55m for each of Frenkie de Jong and Matthijs de Ligt.
The Dutch pair have emerged as two of the biggest prospects in European football, and the likes of Manchester City, Liverpool, Barcelona and Juventus have been linked with moves for at least one of the duo.
De Jong has a contract at Ajax until 2022 and De Ligt's deal runs until 2021, but it is unlikely to prevent offers from being made during the January and summer transfer windows.
According to Mundo Deportivo, Ajax will demand £66.3m for midfielder De Jong, while De Ligt is valued in the region of £57.5m.
The two Netherlands internationals have helped Ajax qualify for the last 16 of the Champions League, which could lead to the young pair staying at the club until at least the end of the campaign.
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