The Canterbury-Bankstown Bulldogs and Des Hasler part ways, effectively immediately.
4 hours ago
Doncaster have signed Karl Pratt after the former Bradford Bulls player was forced to quit top-flight rugby because of persistent shoulder problems.
"This opportunity was unexpected, but I am thrilled to join a club with huge potential," said the 25-year-old Pratt.
"I can't play at the highest level anymore, but I feel I can contribute the knowledge I gained to the Lakers and be part of something special here."
National League One side Doncaster are chasing promotion to Super League.
Lakers coach St John Ellis added: "It all happened very quickly. I told Karl what we are all about and where we are going and how I felt he could help.
"Having played at the very top level under coaches such as Brian Noble, David Waite and Graham Murray, I believe Karl can be an integral part of our team and help us move forward.
"He has a wealth of experience and talent and will be a massive help in improving our young players."
Pratt, who began his career with Featherstone Rovers before moving to Leeds Rhinos, joined the Bulls in 2002.
He went on to claim winners medals in the Challenge Cup, Super League Grand Final and World Club Championship.
He also represented Great Britain against New Zealand in 2003.
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Thanks to www.bbc.co.uk for this news.