Thursday proved a busy day for the Serie A club, who also sold Sergio Floccari to Sassuolo for an undisclosed fee and loaned left-back Vinicius to Serie B side Padova with an option to buy in the summer.
A club statement read: "SS Lazio announces that it has reached an agreement with the Spanish club Valencia CF for the temporary transfer agreement with an option for the player Helder Manuel Marques Postiga.
"The club also announces that it has sold Sergio Floccari to Sassuolo outright.
"SS Lazio also announces that the player Vinicius De Freitas Ribeiro has been temporarily transferred to Padova."
That may not be the end of the January transfer business for the capital club, with speculation over Hernanes mounting after he reportedly left the club's training ground in tears ahead of a possible move to Inter Milan.