Kiffin hired Kennedy Pola on Saturday to be offensive coordinator and running backs coach for the Trojans.
Titans coach Jeff Fisher said he was upset by the fact that Kiffin didn't contact him before reaching out to Pola.
On Monday, Tennessee Football Inc., the company that owns the Titans, filed a suit accusing Kiffin and USC of violating Pola's contract.
Kiffin, in New York on Tuesday for a Pac-10 media event, says Pola's hiring "was done no differently than any we did at SC or Tennessee. I didn't anticipate this. No one would have."