Bath Rugby's Rob Webber and Sam Burgess will train with England at Pennyhill Park this week as they prepare to face Scotland on Saturday.
Webber comes in for Tom Youngs, whose training will be limited on Tuesday, whilst Burgess is included to continue his experience of the England environment.
Henry Slade replaces Brad Barritt, who suffered an ankle sprain playing for Saracens on Sunday and will miss the rest of the RBS 6 Nations.
Tom Croft suffered a dislocated shoulder and will remain under the care of the Leicester Tigers medical team while Henry Thomas will be treated by Bath for a shoulder strain. Both will be unavailable for the remainder of the tournament.
England Head Coach Stuart Lancaster said: “The weekend’s games gave us plenty to think about in terms of looking at guys who will have benefitted from the additional game time. It’s unfortunate that Brad was injured but Henry Slade has been playing well for Exeter and it’s good to be able to call him in. We also wish Tom and Henry all the best for their recovery.
“Mike Brown trained fully last Friday while Luther Burrell and Kieran Brookes should be fit to train tomorrow and we are looking forward to two full days of training before we announce the side on Wednesday.
“Sam Burgess will also come into camp to further his experience of this environment as Bath have no game at the weekend.”
Dave Attwood (Bath Rugby)
Kieran Brookes (Newcastle Falcons)
Calum Clark (Northampton Saints)
Dan Cole (Leicester Tigers)
Alex Corbisiero (Northampton Saints)
Nick Easter (Harlequins)
Dylan Hartley (Northampton Saints)
James Haskell (Wasps)
George Kruis (Saracens)
Courtney Lawes (Northampton Saints)
Joe Marler (Harlequins)
Geoff Parling (Leicester Tigers)
Chris Robshaw (captain, Harlequins)
Mako Vunipola (Saracens)
Billy Vunipola (Saracens)
Rob Webber (Bath Rugby)
Tom Wood (Northampton Saints)
Tom Youngs (Leicester Tigers)
Mike Brown (Harlequins)
Sam Burgess (Bath Rugby)
Luther Burrell (Northampton Saints)
Danny Care (Harlequins)
Danny Cipriani (Sale Sharks)
Kyle Eastmond (Bath Rugby)
George Ford (Bath Rugby)
Alex Goode (Saracens)
Jonathan Joseph (Bath Rugby)
Jonny May (Gloucester Rugby)
Stephen Myler (Northampton Saints)
Jack Nowell (Exeter Chiefs)
Henry Slade (Exeter Chiefs)
Billy Twelvetrees (Gloucester Rugby)
Anthony Watson (Bath Rugby)
Richard Wigglesworth (Saracens)
Ben Youngs (Leicester Tigers)