England winger Jonny May will see a specialist on Monday to examine a fractured nose sustained in his side's defeat to France.
A decision on his availability for selection against Scotland at Murrayfield on Saturday will be made following that examination.
Courtney Lawes (Northampton Saints) suffered a bruised cheekbone but no structural damage and will be available for selection.
Under the Elite Player Squad agreement England will have 33 players in camp with Freddie Burns returning to the senior squad following his two appearances for England Saxons, while Stephen Myler (Northampton Saints), Rob Webber (Bath) and Richard Wigglesworth (Saracens) remain with their Premiership clubs.
Forwards (17): David Attwood, Dan Cole, Dylan Hartley, Matt Kvesic, Tom Johnson, Joe Launchbury, Courtney Lawes, Joe Marler, Ben Morgan, Matt Mullan, Chris Robshaw, Ed Slater, Henry Thomas, Billy Vunipola, Mako Vunipola, Tom Wood, Tom Youngs.
Backs (16): Chris Ashton, Brad Barritt, Mike Brown, Freddie Burns, Luther Burrell, Danny Care, Lee Dickson, Kyle Eastmond, Owen Farrell, George Ford, Alex Goode, Jonny May, Jack Nowell, Billy Twelvetrees, Ben Youngs, Anthony Watson.