Dmitri Arhip will miss Saturday's Guinness PRO12 game against Zebre after being called up for international duty.
The prop has been named in the Moldova squad playing Sweden in Malmo at 2.00pm (UK time) on Saturday afternoon in FIRA Championship D1.
He will then return to Wales on Sunday to prepare for the Ospreys' European Rugby Champions Cup opener against Exeter Chiefs at the Liberty Stadium on Sunday 15th November, 5.30pm.