The Millers have beaten off intrest from Charlton and Doncaster Rovers to sign 30 year old Will Grigg from Sunderland.
The Northern Ireland international has fallen out of favour at the Stadium of Light, having been there since 2019 and scoring 5 goals from 47 appearances.
He spent time on loan at MK Dons last season where he faired better, scoring 8 from 20 appearances..
Grigg joins the Millers on loan until the end of this season