"Paul James has been one of the form props in the Welsh regions so far this season and we are confident he will be a more than able deputy for Gethin," said Wales head coach Warren Gatland.
"Obviously it's not ideal for us to lose Gethin at this stage and we wish him a speedy recovery."
Jenkins will remain in the Wales camp and his injury will be re-assessed next week.
Paul JAMES (OSPREYS - Cap No 1,021)
DoB: 13.05.82. 6'1" / 1.86m. 17st 7lbs / 111kgs
International record: 5 caps (W 3, L 2)
Rhys GILL (SARACENS)
DOB: 30.10.86 - Rhondda Valley
Ht: 1.80m (5'11") / Wt: 109kgs (17st 2lb)
International Record: Uncapped