England head coach Stuart Lancaster has handed prop Mako Vunipola and hooker Tom Youngs squad calls ahead of their upcoming November Series.
The squad is for the game against Fiji at Twickenham on November 10.
32 players will meet at St George's Park, Burton on Sunday, including James Haskell, Ugo Monye, Mako Vunipola and Tom Youngs - all promoted from the England Saxons Elite Player Squad as injury replacements for Tom Croft, Ben Foden, Alex Corbisiero and Rob Webber respectively.
"As a coaching team we can't wait to go into camp and get the guys focused on what will be a massive challenge in the QBE Internationals - Fiji and then the three major Southern Hemisphere teams in successive weeks," said England head coach Stuart Lancaster.
"We have been impressed with some of the rugby we have seen in the Aviva Premiership and Heineken Cup and are looking forward to the players bringing that form to Twickenham.
"It's great to be able to give Mako a chance in the squad. He has come through our age grade sides and made a real impact at Saracens. Likewise Tom Youngs, who was with us on tour in South Africa, and we know what James Haskell and Ugo Monye are capable of if they get their opportunity."
England will be at the Football Association's new sports training and development centre from Sunday, October 28 to Thursday, November 1 before returning to their usual training base of Pennyhill Park, Bagshot on Sunday, November 4 ahead of the Test against Fiji.
Meanwhile, the England Saxons coaching team has been finalised, with John Fletcher joining as backs coach for the internationals against the Ireland Wolfhounds and Scotland A in the New Year.
The former Newcastle Falcons boss returns to Kingston Park on Friday, February 1 for the match against the Scots, a week after the Saxons face the Wolfhounds in Ireland.
Fletcher, the England U18 Head Coach and RFU's Professional Player Development Manager, will join Head Coach Jon Callard, with Simon Hardy responsible for the forwards.
"We are delighted to have John on board as we focus on winning two demanding games. His expertise working with a wide group of players makes him a perfect fit for England Saxons and he'll bring tremendous passion to the role," said Callard.
Backs: Anthony Allen (Leicester), Chris Ashton (Saracens), Brad Barritt (Saracens), Mike Brown (Harlequins), Danny Care (Harlequins), Lee Dickson (Northampton), Owen Farrell (Saracens), Toby Flood (Leicester), Alex Goode (Saracens), Jonathan Joseph (London Irish), Ugo Monye (Harlequins), Charlie Sharples (Gloucester), Manu Tuilagi (Leicester), Jordan Turner-Hall (Harlequins), Ben Youngs (Leicester).
Forwards: Mouritz Botha (Saracens), Dan Cole (Leicester), Phil Dowson (Northampton), Dylan Hartley (Northampton), James Haskell (Wasps), Tom Johnson (Exeter), Courtney Lawes (Northampton), Joe Marler (Harlequins), Ben Morgan (Gloucester), Tom Palmer (Wasps), Geoff Parling (Leicester), Chris Robshaw (Harlequins), Mako Vunipola (Saracens), Thomas Waldrom (Leicester), David Wilson (Bath), Tom Wood (Northampton), Tom Youngs (Leicester).