ABC11 has learned the interview is happening out of state - possibly in Atlanta.
NC State said there would be no hiring announcement Wednesday. N.C. State Athletic Director Debbie Yow told ABC11 Wednesday evening that she doesn't have a frontrunner at this point but may have one in "48 hours or so."
Dykes has a 9-3 record at Louisiana Tech this season. The Bulldogs will appear in consecutive bowl games for the first time since 1978.
NC State fired O'Brien Sunday after six seasons.
O'Brien went 40-35 after coming to Raleigh from BC following the 2006 season. He took the Wolfpack to three bowl games, but won't coach in a fourth when N.C. State receives its bid next week.