Both Alesi and Prost have said in the past that Le mans is too risky and I doubt that either would be in any driver line up for a race.
I expect one could be seen testing the car for PR reasons however.
I think one of the drivers at Le mans will be British, Herbert is past his best I think, and has said something about racing an Aston so I think he is ruled out. Guy Smith is a possible, I can't understand why more teams don't use him, maybe he is not as good as we are led to think or has other problems? what about Justin Wilson could he be available.