"I watched the draw and when Liverpool's name came out to play us I just couldn't believe it," Mellor told liverpoolfc.tv yesterday.
"It will also be a bizarre experience for me to play against the likes of Stevie G and Carra. I always want Liverpool to do well and it would be fantastic if Stevie could lift the Premier League title at the end of the season.
"There will be a full house at Deepdale and there is a stand called the Bill Shankly Kop so there will be a special atmosphere.
"Hopefully I will be fit and the manager picks me. I won't eat over Christmas so I can get in top shape for the game!
"I'll never forget my time at Liverpool. The staff were brilliant and it's such a special club to play for.
"I have some great memories from my time at Anfield and hopefully I'll get a good reception from the Liverpool fans."