Stephen Graham says Jodie Comer brought something to the studio that you wouldn't often see on a TV set.
The pair star in Channel 4 drama Help, which airs next week.
Based in a fictional Liverpool care home, Help tells the moving story of the relationship between a young care home worker, played by Jodie Comer, and a patient, played by Stephen Graham, whose lives are changed forever by the onset of the coronavirus pandemic.
READ MORE: Trailer for Jodie Comer and Stephen Graham's Covid drama set in Liverpool
Kirkby-born Stephen says Jodie is "a joy" and that he loved working with her.
Speaking to the ECHO, he said: "I feel like we work in very similar ways.
"We had a lovely time, there were giggles when there shouldn't have been giggles, as is often the case on set.
"Jodie is rapidly going to become one of the finest actors we've ever had.
"She's just a joy to work with, we just sat and played and it was gorgeous."
But the best thing about her, Stephen continued, was that she "brought Donna's Scouse to set!".
Jodie has previously posted about eating her mum's food in the studio.
In February, the former St Julie's pupil said she was filming on set in Liverpool and was determined not to miss out on her mum's Sunday roast.
Jodie, 28, shared several photos of herself with a delicious looking roast piled high in a dish.
Explaining how she managed to sample the roast Jodie said in the caption: "All the emotions... Nothing gets in the way of me and my mum's roast, not even Sundays on set.
"I love you mum... and Brian for the safe delivery. #jammycow."
Jodie and Stephen have worked together just once before - on mini-series Good Cop in 2012.
Jodie's career then took a life-changing turn following an introduction to Stephen's agent, Jane Epstein.
Ms Epstein had a meeting with Jodie and later became her agent, which kickstarted her acting career and led to the audition for role of Villanelle in Killing Eve.
In Jodie's 2019 BAFTA acceptance speech, she said she owed Stephen a pint.
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