Prime Minister Benjamin Netanyahu has said Israeli airstrikes had killed two successors to Hezbollah’s slain leader, as Israel expanded its ground offensive against the group with a fourth army division deployed into south Lebanon, Reuters reports.

Netanyahu spoke in a video released by his office hours after the deputy leader of Hezbollah, which is reeling after a spate of killings of senior commanders in Israeli airstrikes, left the door open to a negotiated ceasefire.

“We’ve degraded Hezbollah’s capabilities. We took out thousands of terrorists, including [Hassan] Nasrallah himself and Nasrallah’s replacement, and the replacement of the replacement,” Netanyahu said, without naming the latter two.

Israeli Defence Minister Yoav Gallant said Hashem Safieddine, the man expected to succeed Nasrallah, had probably been “eliminated”. It was not immediately clear whom Netanyahu meant by the “replacement of the replacement”.

Later, Israeli military spokesman Daniel Hagari said Israel knew Safieddine was in Hezbollah’s intelligence headquarters when fighter jets bombed it last week and Safieddine’s status was “being checked and when we know, we will inform the public”.