The former Coronation Street and Holby City actor has signed up for the role of Patrick Blake, who is the biological father of established regular Dodger Savage.
Sheffield appeared on Lorraine today (November 14) alongside co-star Nikki Sanderson and hinted that there could be surprises in store involving Patrick.
Pictured: Nikki Sanderson and Jeremy Sheffield on Lorraine.
Describing Patrick, he commented: "I can only tell you a certain amount, I don't want to give it all away. He's nice, he's intelligent, successful. Then there's a whole other side to him which I'm not going to tell you, because that's to be revealed."
Asked what attracted him to Hollyoaks, he replied: "There's a big change with a new producer - Bryan Kirkwood, who's amazing. He was on EastEnders before, Hollyoaks before that and Coronation Street as well, so it's an exciting time.
"But also because of this character - I really can't tell you everything, but he's a very complex character and I've not played anything like it before."
Meanwhile, Sanderson told show host Lorraine Kelly that her character Maxine Minniver is hiding her intelligence.
Sanderson said: "She's fantastic - I absolutely love playing Maxine. She's such a fun character to play because she does so many things that you can't do in real life, so it's great. You get to do it and not get into trouble!
"Even though she's fairly ditzy, I don't think she is actually ditzy - she's one step ahead. She uses that to get ammunition over people, who then think she's not as clever as she is. She's very, very fun to play, but I think she's got that side to her where she is quite selfish."
Maxine made her Hollyoaks debut a few days ago, while Patrick joins screens next week as Dodger finally manages to track him down. Get the Inside Soap magazine on your iPhone or iPad