22-year-old winger Anthony Forde joins the Millers having only previously represented Wolverhampton Wanderers, Scunthorpe United and Walsall in his professional career.
He began his journey in football with hometown club Ballingarry FC as a youngster but departed for the Midlands in 2009 to join the academy setup at Molineux.
It was at Wolves that he was handed his professional debut featuring in a League Cup tie against Northampton Town in August 2011.
Forde appeared 21 times for the Molineux-club and took in a loan spell with Scunthorpe United and by this time had been capped by his native Republic of Ireland at U19 and U21 level before leaving to join Midlands neighbours Walsall in 2014.
The 22-year-old Irishman impressed during his time at the Bescot Stadium despite his tender years and has made over 60 appearances for the Saddlers, playing an instrumental role in the Saddlers push for promotion last season.