Fifty-five England players have joined head coach Stuart Lancaster at Loughborough University for their summer training camp.
The squad will undergo strength and conditioning assessments as well as rugby training over the next three days before returning to their clubs on Wednesday lunchtime.
Among the notable inclusions were loose-head prop Alex Corbisiero and back row Tom Croft, both of whom have returned to the national set-up after lengthy spells out with knee injuries.
Sale fly-half Danny Cipriani kept his place after returning to the England fold on the summer tour to New Zealand while Saracens back row Jackson Wray is a new name.
Dan Cole, Sam Dickinson and Ollie Devoto all missed out due to injury.
Lancaster said: "This camp will give us a chance to get the wider squad together and an opportunity to review the New Zealand tour.
"It will be an important few days for us in terms of complementing the work that the clubs have been doing in pre-season with their strength and conditioning but also from a rugby point of view.
"The next time we meet will be two weeks before we play New Zealand in the QBE Internationals, so this time together is vital."
England were beaten 3-0 in New Zealand, suffering narrow defeats in the first two Tests before a convincing loss in the final match in Hamilton.
A senior squad of 33 players and a 32-man Saxons party will be announced in October ahead of the November internationals.
Lancaster praised Premiership Rugby for allowing him to name his squad later than normal, saying: "In collaboration with Premiership Rugby we have been given the flexibility to announce the England Senior and Saxons squads in October, much closer to our four international matches in November.
"We appreciate their support of our proposal, which enables time to assess the first part of the club season and therefore select players who are in form leading into an important series for us.
"It also allows an opportunity for players not involved in the training camp this week to put down a marker in terms of their performances ahead of the squad announcement."