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WORCESTER Warriors have been forced to make two changes ahead of tonight's Aviva Premiership clash with Northampton Saints at Sixways (7.45pm).

Flanker Marco Mama comes in for Sam Lewis at seven, while prop Na'ama Leleimalefaga starts in place of Val Rapava Ruskin.

Matt Cox and Ryan Bower are called into the replacements.

Warriors: 15 Chris Pennell, 14 Cooper Vuna, 13 Wynand Olivier, 12 Ryan Mills, 11 Tom Biggs, 10 Tom Heathcote, 9 Jonny Arr, 1 Na'ama Leleimalefaga, 2 Niall Annett, 3 Nick Schonert, 4 Donncha O'Callaghan, 5 Darren Barry, 6 Phil Dowson, 7 Marco Mama 8, GJ van Velze (C). Replacements: 16 Dan George, 17 Ryan Bower, 18 Joe Rees, 19 Darren O'Shea, 20 Matt Cox, 21 Charlie Mulchrone, 22 Alex Grove, 23 Perry Humphreys.