Although Koscielny is not guaranteed a place in Blanc's final squad for Poland and Ukraine, Wenger insists a chance is just reward for the 26-year-old's excellent campaign.
"He is right to say he has progressed," the Frenchman told arsenal.com. "He has done well and got stronger with us and deserves a place in the provisional squad.
"I think he is ready for the Euros. The problem for Laurent is that he doesn't have a lot of options in that position, but he has gained in authority and is ready to play."