The 26 year-old made the move to Langtree Park from New Zealand Warriors during the off-season, but his partner Grace is still Down Under, with the arrival of their second child due anytime this month.
Peyroux will be in constant contact with her through Skype, but head coach Keiron Cunningham feels assured that his new signing is fully focused on the new chapter in his career.
“Dom has given me a solemn oath that he will give his best,” Cunningham told the St Helens Star.
“To be fair to Dom, his wife is due to give birth in Australia around the time of our pre-season game against Widnes. He will, however, miss it and play in the friendlies and said he will watch the birth on Skype, so he is definitely committed.”
Cunningham has said that he has yet to pick his starting team for their Super League opener against Huddersfield Giants and that these pre-season games could be a chance for the likes of Peyroux to assert their claim for a place.
“I said to Dom that no place is guaranteed and that I wanted to see him train and play in the friendlies,” he said.
“I have still not picked my side. Dom has been running at centre and Percy can play a bit of wing and has been training there as well. Jordan Turner has been running at six and centre, too. We have got players who can play in multiple positions and that is definitely going to help further down the track.”