The Rossoneri remain determined to hang onto their most prized performers but the Monza native conceded that anything can happen before the start of the new season
The Rossoneri turned down a June offer of €46 million from Paris Saint-Germain for their Brazilian centre-back, who subsequently penned a contract extension until 2017, while the club have repeatedly insisted that their Swedish striker is also going nowhere.
However, when asked during a press conference on the first day of pre-season if both players are definitely staying put, Galliani was noncommittal.
"Everything is possible in life; the market is ever changing," the Rossoneri chief opined. "That is not to say they will leave. I am just saying that anything is possible - things happen that you don't expect.
"The transfer window is very long, who knows what will happen?
"Last year I never imagined that I would be able to sign [Antonio] Nocerino [on deadline day]. Anyway, the AC Milan squad on August 31 will be competitive."
Galliani was then asked if Milan would be bringing in any more 'top players' before the start of the new Serie A season, and the Monza native admitted that the Serie A giants are no longer in a position to sign the game's most high-profile performers.
"I do not know what you mean by top players, maybe players who are expensive," he queried. "I repeat, we are too far behind the Spanish. I said that a few years ago. You need to forget about big names.
"Once upon a time great players arrived in Italy, but that is no longer possible. Certain players with big transfer fees and big salaries are no longer available to Milan, Inter or Juventus.
"Twenty years ago we made more money than Real Madrid and Barcelona; now we net half of what they generate in revenue.
"Italy has changed as a country and the economy has changed. The problem is not Milan, but all of Italian football.
"Maintaining a club like this is a superhuman effort and generates costs not compatible with this country's economy."