Saracens flanker Calum Clark out for 12 weeks with a broken arm sustained against Leicester Tigers last Sunday.
The former Northampton Saints openside was forced from the field during the 18th minute of the match at Allianz Park.
Having joined Saracens from Saints over the summer, Clark adds to Mark McCall's injury woes with Billy Vunipola and Mike Rhodes both also out injured.
Clark looks likely to miss the remainder of Saracens season, with the London side hunting both domestic and European glory once again.
Former England u20's backrow Ben Earl looks likely to benefit from Clark's injury, taking the step up from fringe player to perhaps a regular starter
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