The Rossoneri midfielder felt his side started strongly in their 4-1 defeat on Tuesday and has urged his team-mates to take the positives from the game
The Rossoneri sit in mid-table in Serie A after a poor campaign which eventually cost coach Massimiliano Allegri his job in January.
Diego Simeone's troops are in the middle of the Liga title race and have now progressed to the last eight of the Champions League after a resounding victory, but the Italian insists there is not that big a gulf between the two teams.
"We have to start back from those 20-30 minutes when we were playing at their level," he told the club's offical website.
"It's a shame as we conceded immediately once the game started. We were playing well at 1-1 and then there was that own goal. It's a bad day for all of us.
"After 2-1 they overcame us, especially in the second half. When you lose 4-1, you can't talk about good individual performances. We were in trouble for a lot of the game.
"I want to start again from that 20-30 minutes in the first half when we were at 1-1. We'll get back on our feet, starting from tomorrow and analyse the positives and the negatives from the match.
"Now we have 11 games left and we want to win them all to end the season in the best way possible. This was a good chance here this evening but we didn't take it. Now we have to get back on our feet as soon as we can.
"The start of the match was bad and we can't deny that. After we got to 1-1, it was more balanced and then we let in an unlucky goal that cut us off at the legs a bit."