However, Gloucester team mates Freddie Burns, Matt Kvesic and Henry Trinder have been released back for club duty.
England Head Coach Stuart Lancaster said:
"It's never easy deciding who to select and that's what you want - players pushing hard for places across the board.
"We have had two good days of training here at Pennyhill Park and, added to last week in Leeds, we are in good form and looking forward to the game.
"Geoff Parling sustained a mild concussion during a contact session this afternoon and will undergo the recommended graduated return to play protocol.
"As such, he will be unavailable for Saturday's game but will stay in camp with a view to returning to training next week."
England squad:
Forwards
Dave Attwood (Bath Rugby), Dan Cole (Leicester Tigers), Dylan Hartley (Northampton Saints), Joe Launchbury (London Wasps), Courtney Lawes (Northampton Saints), Joe Marler (Harlequins), Ben Morgan (Gloucester Rugby), Chris Robshaw (Harlequins), Billy Vunipola (Saracens), Mako Vunipola (Saracens), David Wilson (Bath Rugby), Tom Wood (Northampton Saints), Tom Youngs (Leicester Tigers)
Backs
Chris Ashton (Saracens), Mike Brown (Harlequins), Lee Dickson (Northampton Saints), Owen Farrell (Saracens), Toby Flood (Leicester Tigers), Ben Foden (Northampton Saints), Joel Tomkins (Saracens), Billy Twelvetrees (Gloucester Rugby), Marland Yarde (London Irish), Ben Youngs (Leicester Tigers)
The following players have been released back to their Aviva Premiership clubs.
Freddie Burns (Gloucester Rugby), Luther Burrell (Northampton Saints), Danny Care (Harlequins), Kyle Eastmond (Bath Rugby), Alex Goode (Saracens), Tom Johnson (Exeter Chiefs), Matt Kvesic (Gloucester Rugby), Henry Thomas (Sale Sharks), Henry Trinder (Gloucester Rugby), Rob Webber (Bath Rugby), Christian Wade (London Wasps)
