LATEST NEWS: One big name replaces another at Peterborough United.
Collison, a former Wales international and West ham United player, managed Posh under 18s last season, a role that will now be taken by club legend David Farrell.
Collison is expected to move to another Football League club.
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Hide AdSemple ran the club’s under 13-18 development team. He has taken up a post with the Football Association.
Academy Head of Sports Science and Medicine Rob Rowland has also left the club to work with Swansea City Under 23s.