By John Cross Football chiefs have had to put an emergency plan in place for a potential FA Cup final and Championship play-off date clash. The FA Cup final is set in stone at Wembley for Saturday, May 25, with the Championship play-off final due to be at Wembley 24 hours later. But Leicester and Coventry are still in the FA Cup and could yet both be involved in the Championship play-offs which has raised the possibility of a date switch. Championship leaders Leicester go to Chelsea on Sunday for their FA Cup quarter final and are only two games away from the final. Leicester have had a recent…