With Dougie Hall and Pat MacArthur on Scotland duty and Finlay Gillies and Fergus Scott both out injured, head coach Gregor Townsend has moved to bring in the three players to fill the gap in the Warriors roster.
Fraser Brown and Kevin Bryce, both from Heriot's, will join Gerwyn Price who has been on the radar of the Welsh regions and currently plays his rugby with Cross Keys.
The 27-year-old played hooker for Neath for five years before helping Keys to the final of the British and Irish Cup last season.
Brown, a former Scotland U18 and U20 cap has previously been on the books of Edinburgh Rugby and was named in the Warrior's Heineken Cup squad as a stand-in for the then injured Pat MacArthur.
Gregor said: “Fraser Brown and Kevin Bryce have been impressive for Heriots this year and Gerwyn has long been spoken of as someone with the ability to play professional rugby. It’s obviously disappointing for both Finlay and Fergus to be out injured at the same time as Dougie and Pat are deservedly involved with Scotland, but I believe we have found the best possible solution for the club."
“We find ourselves in an unusual situation with all four of our hookers out of action but I’ve no doubt we have secured quality replacements in Gerwyn, Fraser and Kevin. We will be observing them closely this week at training to assess who gets the nod to be involved against Zebre this Sunday.
"We have some big games coming up so I’ll be looking for them to show just how good they can be at this level."
“I’m sure that the three guys we’re bringing in will relish the opportunity to compete for selection in the PRO12 and I look forward to working with them over the coming weeks.”