Berba eventually signed for Fulham last night.
"These are very normal things that happen in the transfer market, especially in the last few days," Marotta told Sky Sport Italia.
Fiorentina had accused Juve of arrogance and lacking sporting ethics in their interception of negotiations.
"We only approached Manchester United and got close to the player after discovering he had turned down Fiorentina. There was an offer from Fulham, but he wanted to evaluate our proposal too and give a definitive response tonight.
"He wants to stay in the Premier League. Why was he in Munich? His wife is from there."