Clive Griffiths is well on his way to building the Knights’ new-look front line after landing Scottish youngster Colin Phillips.
The 22-year-old is the second new tight-head prop Griffiths has snapped up for far this summer, following the acquisition of Ross Davies from Rotherham.
And despite his age, Phillips is expected to push Davies hard for a starting berth.
Forwards coach Glen Kenworthy said: “Colin is an up-and-coming prop with heaps of ability and has plenty of first class experience already under his belt, but it is his potential that is really exciting.
“He’s a really strong, physical scrummager with a high work rate and gives us another fantastic option at the front, while building competition for places.
“He fits the right mould at Doncaster and has a lot to offer on the pitch and in the changing room. He’s been on our radar for a while and to secure two tight-heads in Colin and Ross, both of high standard, is a great coup.”
Phillips has previously played for Edinburgh, Currie and Blackrock College RFC as well as representing Scotland U20s at the Six Nations and World Cup.
The Knights have also re-signed reliable outside half Jamie Lennard.