Flick has an embarrassment of riches at his disposal in the centre of the park with Pedri, Frenkie de Jong, Gavi, Dani Olmo, Fermin Lopez, Marc Casado, Marc Bernal, and Oriol Romeu all in his squad.
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According to Spanish outlet Sport, the German is worried about a bloated squad and could sanction a sale to help raise much-needed funds.
Lopez and Casado have both previously been linked with moves to the likes of Chelsea and Atletico Madrid, along with several Saudi Pro League clubs.
The La Liga champions failed to sign winger Nico Williams due to their inability to offer registration guarantees, sales would help them with their ongoing financial issues.