The Villarreal forward is already said to have agreed personal terms with his former employers, but the Colorado are remaining tight-lipped on any proposed transfer
According to Globesporte, the Brazilian outfit have already agreed personal terms with the forward, who left the Beira-Rio for El Madrigal in 2007.
The paper claims that all that Internacional are waiting on Villarreal to accept their offer, but the club's vice-president of football Luciano Davi was giving nothing away when quizzed on Nilmar's proposed return.
"Inter is working on hiring two to three players," he is quoted as saying by Globoesporte. "While the [deals] are not finalised, they are all still just dreams."
Nilmar, who has 23 Brazil caps to his name, had been on the verge of joining Sao Paulo earlier this year but the deal collapsed because of the player's wage demands.
It is believed that Villarreal, who were relegated from the Spanish top flight last season, have higher offers for the 27-year-old striker but he is said to be set on a return to the club where he started his career.