The England international also qualifies for Scotland and Clarke wants to know his plans.
Clarke said: “We both have each other’s phone numbers. I don’t know is the honest answer to that one. I will wait and see how it pans out.
“There have been loads of names, loads of club managers and agents putting their players forward. They have to be good. They have to be committed, they have to want to play for Scotland.
“I will be able to take 26 players, that has been decided. So there are some spaces there, but not too many.
“We should be very grateful and loyal to the players that have got us there, I think that is very important.
“That is something we have built over the last six and a half years. We have built a trust with this group of players that we understand each other.
“If you want to get into this squad then you have to be good and committed and there will be some spaces.”