Cardiff made three changes on the side that defeated Ospreys with the Danny Southworth, Lock Josh Mcnaly, Fanker Thomas Young coming to Corey Domachowski, Ben Donnell and Alex Mann.
Domachowski and Donnell fall into the replacement seat, while Man, who recorded two attempts against Ospreys, was not included in the team of 23 men.
Monster made seven changes on the side that lost to Bulls in Tomund Park last week.
Michael Millen will appear for the first time with Mike Haley, Calvin Nash, Criging Casey and Gavin Com
Veteran Peter Umhaouni is missing again as he recovers from the tight knee strings, while Tom Ahren, Stephen Artcher, Connor Murray, Josh, Eshirly and John Hodnit are not available.
Cardiff: Kam Winet Josh Adams, Harry Milard, Ben Thomas, Gabriel Hamer Web; Calum Shidi, Johann Mold; Danny Southworth, Liam Bilcher (Captain), Kiron Asiri, Josh McKinale, Teddy Williams, James Putham, Thomas Young, Toulobi Valeto.
Alternatives: Ivan Lloyd, Cori Domashovsky, Reese Litrick, Rori Thornton, Alon Lawrence, Ben Donil, Davis pain, Tenus de Bir.
Monster: Mike Haley; Calvin Nash, Tom Farrell, Alex Nanakville, Thakir Abrahams; Jack Crowley, Craig Casey; Michael Millen, Niall Anellusal, John Ryan, Finan and Ishryly, Tadg Bern (Captain), Jack Odonugu, Alex Kenedin, Gavin Combes.
Alternative: Diamuid Barron, Mark Donnyly, Ronan Foxe, Jean Kleyn, Ruhandhán Quinn, Paddy Patterson, Tony Butler, SEáN O'Brien.
Ruling: Gianluca GNECCHI (FIR)
Assistant refereesMike English and Aaron Barry (WRU)
TMOStefano Roseni (Fir).
