Lazio coach Vladimir Petkovic was delighted with Ederson's full debut in victory over Siena.
Ederson struck in the 2-1 win.
Petkovic said: "Ederson is not at his best because after a long injury lay-off he cannot hold out for 90 minutes. He also has to settle into our tactics and the goal can only do him good.
"He is a versatile player and can certainly work alongside Hernanes, but it depends on the type of approach we want to take."