Both players were undergoing their Juve medicals on Saturday.
Il Corriere dello Sport says Gonzalez arrives from Fiorentina on-loan for €7m with the obligation to buy for €25m plus €5m in bonuses.
Meanwhile, Conceicao joins from Porto. He also joins on-loan with a permanent option worth €7m rising to €10m.
The winger is the son of Porto coach Sergio Conceicao.