Mancini has been tasked with a fresh start for the national team following Italy's failure to qualify for this summer's World Cup, and the 22-year-old is reportedly ready to be included once the Italian federation secures FIFA's approval for the change, potentially in time for September's international fixtures.
That would represent a significant blow for Germany, for whom Tresoldi's performances at Club Brugge have made him a serious short-term option for new head coach Jürgen Klopp, having already caused a stir at under-21 level for the DFB.
Tresoldi's mother is Argentine, meaning the forward is technically eligible to represent three different countries.
Not every outlet agrees the decision is final, however. Bild has contradicted the Italian reporting, suggesting the former Hannover forward has yet to settle on which nation he will ultimately represent.
Tresoldi was born in Cagliari and lived in Italy until he was 13, when his family relocated to Germany, where he came through Hannover 96's academy before qualifying for German youth football.
He has previously said he was open to a conversation with Italy coach Gennaro Gattuso, though Gattuso's own departure since then — and Mancini's arrival — has reshaped the landscape around the decision.
A decision on his club future may also be approaching. Borussia Dortmund, RB Leipzig, Manchester United, Barcelona and Roma have all been credited with interest, with Brugge said to be demanding a substantial €50m for the striker, a figure that reflects his rapid rise since joining the Belgian club from Hannover for around €6m last year.