The 20-year-old joined the Serie A outfit in January and he has become a key starter for them following Joshua Zirkzee 's exit to Manchester United.

The Argentine has three goals and one assist in the Italian top-flight this term and his performances have caught the eye of Arsenal and Chelsea .

Both clubs have sent scouts to watch the youngster in action and Caught Offside claim that there could be a bidding battle for his services soon.

It will be interesting to see whether Castro will consider joining either club as he may not have the guarantee of regular playing time in future.

Everton and Nottingham Forest are also admirers of the young marksman and he could have guaranteed first-team football at one of those clubs.

Bologna are likely to demand at least €40m for the talented ace. They settled for a similar package to part ways with Zirkzee this summer.

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