Defender Clark Robertson has joined Danny Cowley's Portsmouth on a 2 year deal after being released by the Millers.
The 27 year old made 69 appearances for the Millers over the 3 seasons he spend with the club.
Also released at the end of the season was Shaun MacDonald, who has joined Crewe Alex on a 2 year deal.
Injury spoiled the Welsh midfielders time with the Millers, with him only making 32 appearances.
He now teams up with the Millers league one rivals, managed by former Miller David Artell.