PAS' latest move to sack its former vice-president Husam Musa is bound to "shake up" the party further, said a former party stalwart.

Parit Buntar MP Mujahid Yusoff Rawa, former PAS central committee member, said the move would rock the party because of Husam's "strength" in PAS, especially in Kelantan.

"Husam has been very vocal in the party and this has hurt PAS very much," said Mujahid, who is now Parti Amanah Negara vice-president.