Failure to repay their loan by yesterday's deadline has seen Suning surrender ownership of Inter to Oaktree.
Moratti said: "I'm very sorry. I have respect for (Steven) Zhang, he tried in every way to do well and he did well because he won two championships and a lot of trophies.
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"He wasn't able to cover all the debts he owed created for Inter, it's not like he spent the money on his own business. I'm sorry it ended like this."
Moratti added: "It had been in the air for a few weeks, but I was hoping that he would be able to hold onto Inter. Have I heard from him recently? I heard him recently but we had not talked about this topic."