London - Ulster number eight Nick Williams has been banned for eight weeks after being cited for striking Cardiff Blues' Wales international fullback Rhys Patchell, the Celtic League announced on Wednesday.
With the current season due to finish at the end of May, Williams will not be able to resume playing until September 1.
Williams was sin-binned for making illegal contact with Patchell's head at the breakdown in the first half of Ulster's 36-17 home win last Friday, which resulted in the Welshman being stretchered off and taken to hospital.