Chiellini admits they again made too many errors in Saturday's derby.
“We made some mistakes that you cannot afford at this level," Chiellini told DAZN.
“It's a pity, because when we had the sharpness to keep the game in hand, we didn't run many big risks, and we created lots of chances.
“We have to stay united and do as little talking as possible. Let's avoid proclamations, instead working day after day, knowing that we have a very important game coming up on Wednesday.
“We must go forward and try to do our best so we can achieve an important target for us, a Champions League place. We've also got the Coppa Italia Final coming up."