Jay was cast in the Channel 4 soap earlier this year and viewers will see him appear in the role of Brendan Brady's (Emmett Scanlan) son Declan from the beginning of next month.
Speaking on today's edition of Lorraine about the 15-year-old's success, Keith commented: "I know he's very eager to do well. I'd love to be able to show him any areas that he might be going wrong in. I've been looking for those areas, and to be honest I haven't been able to find any!
"Anything he's done, he's done very, very well. He's very natural and he doesn't need my help at all."
Jay, who also appeared on the morning programme, confirmed that he has been seeking advice from his father during the filming process.
"If there was ever a scene that I wasn't so sure about - the emotions going on or whatever, I'd always ask him - because obviously he'd be a lot more educated on it than me," he said. "It's always great to have him there. He lets me do my own thing, though, so it's great."
Meanwhile, Keith also discussed his forthcoming return to Coronation Street as Ciaran McCarthy - explaining that his latest Weatherfield stint will be shorter than expected.
"This return to Corrie is not going to be as long as I would have hoped, because I'm kind of needed in Dublin this year," he said.
"Jay has a big exam year, and my little girl Mia, who has autism, it's her last year in [primary] school and the transition to secondary school is going to be a lot of work for everybody. I'm kind of needed there to try and help make that happen."
Keith returns to filming at Coronation Street in September.
Read more about Jay Duffy's arrival in Hollyoaks:-
> Keith Duffy's son lands Hollyoaks role
> Hollyoaks' Declan Brady 'won't be like Brendan'
> Hollyoaks' Brendan 'to show softer side'
Watch a teaser video for next week's Hollyoaks episodes below:
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