The Argentine scored for Bologna in Sunday's defeat to Inter.
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TMW says Castro is a favourite of Inter management's and they have been following him for the past 12 months.
Indeed, Inter see the youngster as a priority target in 2026, though are prepared to wait until the summer to make their move.
For his part, Castro has spoken openly about his ambitions of playing alongside Inter captain Lautaro Martinez in the future.
His goal against Inter was Castro's fifth for the season. His contract with Bologna runs to 2028.