Crystal Palace midfielder Ledley broke his leg on May 7 but has made a remarkable recovery and has been included in Coleman's squad, as has Robson-Kanu, who has an Achilles injury.
Preparations have started in earnest for Saturday's tournament opener against Slovakia and they began after Wales' heaviest defeat since September, 2013.
Gareth Bale will play some part in Wales' friendly against Sweden on Sunday, manager Chris Coleman has confirmed.
"We get a bit of success, a bit of expectation, sometimes a little bit of complacency and that can give you a little slap in the face", said Coleman, who kept talisman Gareth Bale on the bench for over an hour.
Coleman says Real Madrid superstar Bale is a great example to other players of how to handle the extra spotlight on the side as they prepare for their first taste of tournament football.
"All three came through a session yesterday, they are fully integrated with the squad and it is positive news", said Coleman.
"We are monitoring them daily, but as we speak all three are good".
The Scandinavians were famously fresh off the beach when they turned up in Sweden as late replacements for the disqualified Yugoslavia, yet ended up stunning World Cup holders Germany to lift the title.
Ensconced in a luxury hotel in Chantilly, England are grappling with a diamond that does not shine ahead of their Euro 2016 opener against Russian Federation.
THE former Celtic striker John Guidetti is hopeful his first global goal for Sweden can win him a starting berth at Euro 2016 alongside Zlatan Ibrahimovic.
Coleman said Wales were looking to repeat the same arrangement that had served them well ahead of last year's 1-0 win over Belgium.
Bale: When I first started there were a lot of youngsters being introduced to the team; John Toshack and Brian Flynn oversaw and fast-tracked them through.
"Maybe the best scenario would be to miss his wedding and we'll have a party back home afterwards". We've grown together - we've got used to how global football is played, and I think that's showing now.
"We know we have to improve on that, but we are confident we are capable of doing that".
"We've got to make sure when we arrive at the tournament we're back to where we need to be, and I'm sure that will be the case".
"I don't really know myself what state I will be in".
It means he is ready to go with Liverpool ace Allen from the off at the Stade de Bordeaux after his return from a knee problem, knowing how the former Swansea City passmaster can be key in getting the side at their best.