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According to a Harlequins statement shared by RugbyInsideLine, Jones will assume head coach duties for the club's two upcoming PREM Rugby Cup fixtures.
His first assignment comes against Newcastle Red Bulls at Kingston Park on Saturday, 14 November.
A trip to Saracens follows seven days later.
Both matches are listed on the official Harlequins fixture schedule.
The decision has attracted attention because Jason Gilmore remains the club's permanent head coach.
There is no suggestion that Jones's appointment represents a permanent change at The Stoop.
The temporary promotion comes just weeks after Jones committed his future to Harlequins.
In September, the club announced a new contract for the former Wales international, confirming he would continue as scrum and contact coach.
Jones originally joined Quins as a player in 2015 before moving into coaching three years later.
He was part of the coaching setup when Harlequins lifted the English Premiership title in 2021.
The former Ospreys prop also helped Wales win three Six Nations Grand Slams and toured twice with the British & Irish Lions.
He gained further international coaching experience with Wales in 2025.
His latest assignment offers another opportunity to develop his coaching credentials.
Whether it opens the door to a permanent head coaching position elsewhere remains to be seen.
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