Bath and Wales number eight Taulupe Faletau faces a lengthy spell on the sidelines after suffering a broken arm.
Faletau sustained the injury during his side's 39-24 Premiership defeat to Exeter Chiefs on Friday.
The setback makes the 27-year-old a major doubt for his country's November internationals, with Wales set to take on Scotland, Australia, Tonga and South Africa.
Faletau has started four of six Premiership matches for Bath this season and won 72 caps for Wales, also making four Test appearances for the British and Irish Lions.
Bath begin their European Champions Cup campaign at home to Toulouse on Saturday.
