The Portuguese striker could be on the move again before the end of the transfer window, while the Serie A side is hopeful that Hernanes will not leave the club.
Lazio coach Edy Reja has revealed the Biancocelesti are on the verge of signing Valencia striker Helder Postiga for an undisclosed fee.
The coach has made no secret of his desire to strengthen his squad since taking charge earlier this month and the 68-year-old stated on Tuesday that the club is close to agreeing a deal to bring in the 31-year-old.
"We've been after Postiga for a week. He's got international experience and can play with [Miroslav] Klose," Reja said.
"We were about to finalize the deal last night and I'll be particularly happy if Postiga arrives."
Reja is also hopeful of keeping hold of midfielder Hernanes, who has been strongly linked with Serie A rival Inter.
"We have options if Hernanes does go, but I don't think he's leaving."
The 28-year-old has a contract with Lazio until June 2015.