London Irish back-row forward Chris Hala'Ufia has been banned for two weeks following a Rugby Football Union disciplinary hearing in Coventry.
Hala'Ufia was cited for striking Wasps hooker Rhys Thomas during the Exiles' 30-19 Aviva Premiership victory at the Madejski Stadium on Sunday.
His suspension means he cannot play again until March 12, ruling him out of Saturday's Premiership trip to Northampton.
Claassens was sent off for tripping Gloucester's Jonny May during the Warriors' 29-23 defeat at Kingsholm last Friday.
The ban expires on March 2, meaning Claassens will miss Worcester's home match against Wasps on Friday night.
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