They won't because the loan has gone beyond 28 days and albion can recall dobbie at any point now, even technically 1 minute before kickoff.
This is something that somebody should have said to the OP at the start, way before the abuse that he managed to get for asking a simple question, something which actually hasn't be covered here.
The basic answer is: Dobbie can technically play in the semi-final against Brighton, he just won't.