Ranieri threw on Alvarez for victory over Cagliari yesterday.
The Argentine proved to be the turning point in the game, as he had a hand in both Inter goals.
"I used him twice as a trequartista, in the first he did well and the second not so impressive. I decided to play him down the right, because he can shoot from there and provide golden assists. I believe in Alvarez and he has incredible technique.
"We had to break the deadlock and once we got the first goal it was another Inter, a more vivacious team."