"Ni is a gifted rugby player," said Lewis. "Having spent her younger days playing rugby against boys she has good game understanding and a natural attacking flair. She has a great pass and kicking game and is a real attacking threat across the backline having represented Wales at 10, 12, 13 and 15.
"Naomi is a great role model to up and coming players as she has mastered the key elements of the game and can execute them to the highest standards."
Lewis then concluded: "There couldn't be a better occasion for Ni to reach this milestone, it would be great for Ireland to experience fully Naomi's ability on Friday night!"
The gifted Thomas is taking her achievement in her stride. "For me all caps are important but to reach my 50th is an honour," she said.
"It's definitely a privilege to play for your country and you can't take that for granted," she added.
Thomas has overcome knee surgery to re-inforce her status as one of Lewis's key members of the squad. For the clash against Ireland she moves from outside centre to inside centre in a Welsh side boasting several changes to the backline which failed to fire against France.
"I remember my debut as I was only 18 years old and I scored a hat-trick on the wing," she recalls. "But it's all about Ireland now. We've got to go there and be switched on from the outset. It's really important we get a win because we want to finish as high as possible on the points table," added Thomas.
WALES: Mared Evans, Aimee Young, Ceri Redman, Naomi Thomas, Non Evans, Awen Thomas, Amy Day; Catrin Edwards, Rhian Bowden, Jenny Davies, Gemma Hallett, Rachel Taylor, Catrina Nicholas, Jamie Kift, Mellissa Berry (capt).
Replacements: Claire Horgan, Louise Horgan, Claire Donavan, Lisa Newton, Laura Prosser, Kay Rees, Caryl James.