The two came to blows in the Stadio Friuli locker room after last Friday's 2-0 defeat to Udinese.
"I am so sorry for what happened, but these are things that ought to remain in the locker room and not reach the newspapers," he told Striscia La Notizia.
"In any case, I regretted it immediately after doing such a stupid thing. Erik is a lovely lad, not to mention a great player.
"It's all over now, we can turn over a new leaf."