Gloucester will be without prop John Afoa against Bristol on March 24 after he was handed a one-match suspension for dangerous tackling.
He pleaded guilty to a charge at a hearing for his tackle on Harlequins back Tim Swiel in the Premiership game at Kingsholm last weekend.
The 33-year-old will miss the Ashton Gate fixture, with Gloucester in the midst of a tough week after head coach Laurie Fisher resigned.