Delap prepared for Rams
Delap, who made over 100 appearances for the Rams over a decade ago, said: "When the draw came out I started getting a few texts from friends.
"My wife's family are all Derby fans so it could be interesting. I'm looking forward to it, but we know it's going to be a tough game."
The Championship club represent a difficult barrier for Tony Pulis' side if they are to make the final again following last year's 1-0 defeat to Manchester City.
"We would love a repeat of last year," Delap told BBC Radio Stoke.
"It's a competition we've got a chance of winning because we're not daft enough to believe we're going to win the Premier League."