Clark was called up, what, late Wednesday? So logistics being what they are, they probably had to do it then to make the transition as easy as possible, jump on the team flight to ATH, get acclimated to the team, yada, yada, yada. But he gets the call up notice on Wednesday, then has to wait until Friday to get into the game. Add in the time zone difference. Today is probably going to be the longest wait for a game in his life.