Milan meet Red Star Belgrade in the Europa League tonight on the back of their 3-0 loss.
Pioli said, "We analysed the last performance, only at the end of the first half and the beginning of the second we made our game. We played with little intensity.
"You can fall, it is not a failure to fall in these games but it would be to stand still in the fall points. We must start again with rhythm and consistency.
"I see a group motivated and willing to go back to play as we did a few weeks ago. I told the team that there are 90 days left until the end of the season. It will be decisive days for our season.
"If things go well, there may be 93 days to go before the Europa League Final on May 26.
"I'm not going to say anything about this morning's game in training. Before the Spezia game, I said we had trained well and then we know how it went. We have to prove it in the field."