If CB stocks get real low, then old mate Themi or Francis de Vries would have to be considered. Dylan de Jong is in Israel, and made a few match day squads for his club tail end of last season.
Likewise Weemac (supposedly in Scotland) if any injuries left the midfield looking light. Hay did pick him for the November games last year. But really like Themi, his time is over.
Max Mata would probably be picked ahead of Matt Conroy.