The 20-year-old Julio, also a forward, has failed to break into Sam Allardyce's team - and the arrival of his sibling from Manchester City would hardly make the situation any easier.
Roque looks set to leave City in January after falling behind Carlos Tevez, Mario Balotelli, Emmanuel Adebayor and Jo in Roberto Mancini's pecking order.
Jumping ship: Roque Santa Cruz wants out from Manchester City
Former Eastlands boss Mark Hughes would like to take Santa Cruz to Fulham, but Allardyce admitted last week 'there was no doubt' he would also like to sign the 29-year-old.
And the English adventure could be over for Julio. His dad Aproniano said: 'He is always in the reserves at Blackburn and will see his contract expire in June.
'We are going to see if Blackburn offer him professional terms, as he has been there now since he was 17.
'The idea is for him to stay in Europe but if there is an opportunity with an important Paraguayan team, we will think about it.'
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