All three sat out last week's 29-22 victory at the Madejski Stadium, but are restored as Davies shuffles his pack with a number of changes.
Also recalled are Dan Murphy, Rupert Harden, Will James, Ben Morgan and Rob Cook, while Tom Savage and Freddie Burns switch positions.
The Cherry and Whites will be looking for a fourth straight victory in this season's competition as they bid to strengthen their grip on Pool One, although Davies insists his side are not getting ahead of themselves.
"It's a job that's only half done at the moment," he declared. "It was great to come back the way we did last weekend against Irish, but they showed what a dangerous team they are and what they're capable of.
"We really weren't at the races in the first half last weekend, which was a bit disappointing. We've been like that a couple of times this season and have to guard against that."
Irish will be aiming to bounce straight back from last weekend's disappointing reverse and have opted to start with Shane Geraghty at fly-half for the encounter at Kingsholm.
Elsewhere, Guy Armitage is given the nod at inside centre, Kieron Low comes into the back row, while James Sandford will start alongside Bryn Evans in the second row.
Exiles director of rugby Brian Smith said: "We've made a few changes to freshen up the team this week. The new boys are very enthusiastic and the entire squad is keen to put in a performance at Kingsholm."
Gloucester: 15 Rob Cook; 14 Charlie Sharples, 13 Mike Tindall, 12 Billy Twelvetrees, 11 Shane Monahan; 10 Freddie Burns, 9 Jimmy Cowan; 1 Dan Murphy, 2 Darren Dawidiuk, 3 Rupert Harden; 4 Will James, 5 Jim Hamilton (capt); 6 Tom Savage, 7 Akapusi Qera, 8 Ben Morgan.
Replacements: 16 Koree Britton, 17 Nick Wood, 18 Shaun Knight, 19 Sione Kalamafoni, 20 Matt Cox, 21 Dan Robson, 22 Tim Molenaar, 23 Martyn Thomas.
London Irish: 15 Tom Homer, 14 Topsy Ojo, 13 Jonathan Joseph, 12 Guy Armitage, 11 Anthony Watson, 10 Shane Geraghty, 9 Darren Allinson; 1 Max Lahiff, 2 David Paice, 3 Halani Aulika, 4 James Sandford, 5 Bryn Evans, 6 Kieran Low, 7.Jamie Gibson, 8 Chris Hala'ufia.
Replacements: 16 Scott Lawson, 17 Jerry Yanuyanutawa, 18 Leo Halavatau, 19 Matt Garvey, 20 Declan Danaher, 21 Sailosi Tagicakibau, 22 Steven Shingler, 23 Jack Moates.
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