MacKenzie drops to Welsh bench
London Welsh will look to make it a hat-trick of Aviva Premiership victories when they take on Gloucester on Sunday.
The Exiles followed up their win over Exeter with a 29-19 victory against Sale last time out. And after that success, coach Lyn Jones has made just one change to his starting XV - with Seb Jewell named at full-back and Phil MacKenzie dropping to the bench.
There is a further change among the replacements, with Alfie To'oala preferred to Ed Williamson as back-row cover.
Gloucester boss Nigel Davies has made a trio of alternations to his line-up following the win over Wasps.
Player-coach Mike Tindall replaces the benched Henry Trinder in the backs, while Huia Edmonds and Peter Buxton come into the pack.
Darren Dawidiuk is ruled out with a knee injury, while England No.8 Ben Morgan suffered a dead calf against Wasps.
London Welsh: 15 Seb Jewell, 14 Tom Arscott, 13 Sonny Parker, 12 Hudson Tonga'uiha, 11 Nick Scott, 10 Gordon Ross, 9 Tyson Keats, 8 Ed Jackson, 7 Michael Hills, 6 Daniel Browne, 5 Matt Corker, 4 Jonathan Mills (capt), 3 Paulica Ion, 2 Neil Briggs, 1 Frank Montanella. Replacements: 16 Dan George, 17 Tom Bristow, 18 Arthur Joly, 19 Kirill Kulemin, Alfie To'oala, 21 Nick Runciman, 22 Ryan Davis, 23 Phil MacKenzie.
Gloucester: 15 Rob Cook, 14 Jonny May, 13 Mike Tindall, 12 Billy Twelvetrees, 11 James Simpson-Daniel, 10 Freddie Burns, 9 Dan Robson, 8 Sione Kalamafoni, 7 Andy Hazell, 6 Peter Buxton, 5 Jim Hamilton (capt), 4 Tom Savage, 3 Rupert Harden, 2 Huia Edmonds, 1 Nick Wood. Replacements: 16 Koree Britton, 17 Dan Murphy, 18 Shaun Knight, 19 Will James, 20 Akapusi Qera, 21 Dave Lewis, 22 Henry Trinder, 23 Martyn Thomas.