Former All Black u20 heads to Quins
The 25-year-old, who played for Leicester Tigers and Worcester Warriors, signed a short-term deal with the Harlequins.
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Kingston commented: “I am delighted we have agreed to terms with Jono to come into Harlequins immediately.
"The injuries in the scrumhalf position meant we needed to find the necessary experience and expertise for a tough and important phase of our season.
“Jono fits that criteria and having spoken at length with him, I also know he is the type of character who will fit into the environment we are building at Harlequins.”