Nah Dean talking about the move suggests its an addition not a replacement.
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Speaking of the new signing, Director of Rugby Dean Richards said: "We're delighted to be able to bring a player of Juan Pablo's calibre into the club.
"Over recent months we've seen a number of front row players unavailable for selection due to injury and international duties, and to be able to add Juan Pablo to our options in that area provides us with greater depth on either side of the scrum.
"Juan Pablo is a strong guy who has already proven he can make an impact at the highest level, and we look forward to integrating him into our side over the coming weeks."
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If they can rejuvenate him like they have Saul and Adam Powell then he could be a cracking signing. We are desperate for a proper scrummaging LH. As Vickers (a converted Hooker) is not getting any younger and Fry whilst excellent in the loose is poor at scrum time.