LEON Brown is set to miss the Dragons' must-win Guinness PRO14 clash with Zebre on Saturday – but his fellow Wales tighthead Aaron Jarvis is poised his debut after a miracle recovery from injury.

Brown struggled with a shoulder injury in the build-up to last week’s clash with Leinster in Dublin and was only fit enough to make a brief cameo as back-up to Lloyd Fairbrother.

The 21-year-old, who won three caps last autumn, is expected to sit out the round four meeting with Zebre at Rodney Parade after Jarvis, a summer signing from Clermont Auvergne, made an unexpectedly swift recovery from a torn bicep suffered in pre-season.

“Leon is 50/50 but Aaron Jarvis is possibly back and is doing his return to play protocols and contact preparation. He could feature instead and ideally it will be him to give Leon a bit of time,” said head coach Bernard Jackman.

“Aaron is four weeks ahead of schedule – he is really meticulous in his rehab and is really good pro. He has shocked everybody with how quickly he has come back from a bicep rupture.”

Hallam Amos faces four to six weeks out after suffering a dislocated elbow in last weekend’s 52-10 loss in Dublin.

“The scan wasn’t too bad and he is going to see a surgeon. It is probably four to six weeks, the ligament damage wasn’t too bad.”

Amos’ fellow speedster Ashton Hewitt faces another four to six weeks out with the shoulder injury that he suffered in preparation for Wales’ summer tour.

The spot on the flank against Zebre will be taken by Jared Rosser, who missed the start of the season with a hamstring twinge but scored five tries in the Dragons A team’s Celtic Cup victory against Connacht Eagles.

Jackman is still mulling over his back row selection after openside Nic Cudd impressed in Dublin with Wales internationals Ross Moriarty, Aaron Wainwright and Ollie Griffiths the others that will feature in the matchday 23.

Gavin Henson remains sidelined with a swollen knee and is unlikely to be back for at least two weeks.