Both players came off the bench as Romalu Lukaku and Lautaro Martinez struck in the second-half for the win.
“This win was crucial against a team that sits back. They don't concede a lot," Stellini told Sky Italia.
“We needed an episode to break the deadlock. We were lucky to get that penalty kick and then we did well when we scored that second goal," he continued.
“Sanchez and Eriksen changed the game. We knew it. Eriksen was ready, albeit with some physical problems. We had prepared it this week. We knew they could be dangerous coming off the bench.
“Chris has changed his performances. He's always tried hard. In the beginning, it could be challenging to adapt to a different kind of football, but now he's settled in well.
“Lautaro and Lukaku have many qualities, they are solid and pacey, they complete each other, and they sacrifice for the team.
“Sometimes we have to stop them, telling they can't train too much. Now we can breathe a little bit, and we can take care of every detail.
Antonio Conte was serving a one-match ban, but his communications with the Inter bench were constant.
“Conte speaks always. It's none stop. We knew this game would be challenging. We expect to face more difficulties now. We know there are more games like this one coming.
“I don't bring myself on the bench. I represent an entire staff and many collaborators speak with the coach every day.
“We do everything to support his ideas. We put in so much commitment to help him."