AS Roma coach Claudio Ranieri felt Inter Milan's stronger bench was the difference in last night's eight goal thriller.
Inter were victorious 5-3 on an amazing night.
"We played a very good game and the incidents went against us," said Ranieri.
"Inter deserve compliments for their performance, but so do we, as we reacted and tried to get a difficult situation back on track.
"What we lacked was consistency in the pace of our football. It is a very physical Inter side, so it was the only way to beat them.
"Without taking anything away from my squad, when you come up against a side like Inter, there are differences," confessed the Giallorossi Coach.
"When they make a change, there are always players who can make the difference. Substitutes are crucial for the result and at the moment we're unable to count on them.
"We'll pay a price for Nicolas Burdisso's red card, as with Philippe Mexes also suspended, we will have an emergency situation at the back."