Galliani said that last season, in which Milan's second-half performance took them into the Champions League, proved that there was more than enough ability on the pitch to turn things around.
"Things are certainly not going right, but the same happened last season," Galliani told reporters.
"We have to remain calm as things have gone quite well for us in the Champions League, and the international break has arrived at the right time. We will now be able to recover a few [injured] players."
Milan are currently 12th in Serie A with just two wins from seven games.