The Black Cats have built on the appointment of Paolo Di Canio by bringing an Italian director of football and chief scout to the Stadium of Light
The pair worked together at Udinese and Inter in player recruitment, and look set to continue in similar roles at the Stadium of Light.
Angeloni is credited with discovering Barcelona star Alexis Sanchez who Udinese sold to the Spanish giants for £23 million in July 2011.
"Roberto and Valentino bring with them a wealth of experience, knowledge and football contacts from across Europe and indeed the world and we are delighted to welcome them to Sunderland,” chief executive Margaret Byrne told the club's official website.
"The recruitment of players is, of course, key for any football club and Roberto and Valentino will work closely with the head coach and the board to identify targets as we look to strengthen our squad for next season and beyond."