Welsh region Cardiff Blues revealed that Wales centre Owen Williams is making "positive progress" after sustaining a serious neck injury.
Having sat out the tail end of last season through injury, Rhys Webb has declared himself fit and ready for the new campaign.
Ireland hooker Rory Best will take over from the retiring South Africa Johann Muller as the new captain of Ulster.
Newport Gwent Dragons revealed that flyhalf Kris Burton has left the Welsh region.
Springbok lock Franco van der Merwe will not change the way he plays, despite moving to Irish province Ulster.
Warriors prop Jon Welsh has undergone shoulder surgery and is expected to be out of action for the first few months of the season.
Cardiff Blues confirmed one of the worst-kept secrets, the Chiefs Super Rugby star Gareth Anscombe will join them on a long-term deal.
Glasgow Warriors have signed South African prop Rossouw de Klerk from the Cheetahs, subject to a visa and medical.
Rising South African lock forward Rynier Bernardo has been described as a player with 'huge potential', ahead of his entry into the European game.