Algerian internationalist Bouzid spent two seasons at Hearts from 2009, and has since played in Greece, the United Arab Emirates and his homeland. Silva, meanwhile, left Kilmarnock last summer to play for Olhanense in his native Portugal.
"We have made Ismael an offer and that has to be negotiated" said assistant manager Sandy Clark. "David Silva is another one we are talking to. Whether that will happen before Saturday, I don't know.
"Nacho is not with us now," added Clark. "We have plenty of players who can fill Nacho's role and, as for Tijani, again it is an area where we are fairly well covered."