TMW says the young Argentine is on Forest's shopping list ahead of the summer market.
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Bologna have informed interested clubs that Castro won't leave for less than €60m. However, given their financial concerns, Forest believe Bologna will see for much less.
Forest had a scout at Lazio yesterday to see Bologna draw 1-1 at the Olimpico. Castro led the line on the day for Bologna.
Castro, 21, has a deal with Bologna to 2028.