The Giallorossi stunned Inter 3-1 at the San Siro.
"We knew that Roma would be good at taking advantage of the space we would leave from time to time," the Argentine told Inter Channel.
"It's just that tonight we did it too frequently. Then in the second half, when we were expecting things to go better, they got their second goal
"Roma have proven to be a very solid team and I think they can go far this season - and I hope we're there too."