Milan won 2-1 with Patrick Cutrone hitting a late winner.
“I'd divide the Giallorossi's game into two sections," Capello explained to Il Romanista.
“The first and second half were very different. I didn't much like Roma [in the first half], it was almost as if they weren't playing, just looking at what was happening on the pitch.
“It was almost inevitable that at the end of the first half Milan deservedly went ahead. The Roma I saw last season always tried to impose their game.
“Before Cutrone's goal they'd recovered the game and had several chances to win it.
“I don't think it was a question of the formation, I think this question of formations is a bit 'tired'.
“Results never depend on formation. Roma should have understood in the first half that they needed to play another way."