According to reports, Gantz is weighing the possibility of forming an alliance with Yair Lapid's Yesh Atid party, a bloc that surveys show could win up to 35 seats and therefore potentially have the first opportunity to form the next government.
He has so far said little about the Palestinian issue, or whether he supports the establishment of a Palestinian state.
He added that peace with the Palestinians "must ensure Israeli is secure", but that "we have to find a path which leaves us not controlling other people".
Gantz's ready-to-rumble rhetoric appears to be the only way to bring down the long-serving Netanyahu.More news: How to Watch the 2019 Grammys Online
Palestinian president's spokesman gave a cautious welcome on Wednesday to remarks by Israeli Prime Minister Benjamin Netanyahu's closest election rival suggesting openness to a future removal of settlements from the occupied West Bank. "It's encouraging, if he succeeds and he sticks to this opinion", Nabil Abu Rdeineh told Reuters.
Netanyahu cites the example of Gaza - where Israel unilaterally pulled out its settlements in 2005 and the Islamist group Hamas soon took control - as proof that removing settlements from the West Bank would be unsafe.
Former residents of the Gaza Jewish community known as Gush Katif suffered severe unemployment and significantly increased rates of divorce and stress-related health problems in the years following their experience.
His opponents quickly lambasted him.More news: Grammys Producer Ken Ehrlich Responds to Ariana Grande: "It Was a Surprise"
"Gantz has thrown off the mask and overtaken Avi Gabbay (of the centre-left Labour party). and wants to expel Jews from their homes through a unilateral withdrawal from Judea and Samaria (the West Bank)", Bennett said.
A poll published by the Walla news site on Thursday asks respondents to choose from among Tuesday's top primary vote-getters in deciding who their preferred candidate to lead the Likud after Netanyahu would be.
The prime minister reportedly has said that despite Sa'ar's strong showing in the party election, he would not be appointed to a senior position in the next government if, in fact, Netanyahu is still at the helm. Mr Netanyahu views Saar as a potential replacement and had lobbied party members hard to push him down the list. Among the general public, 33 percent favor Sa'ar, followed in a distant second place by Knesset Speaker Yuli Edelstein at 7 percent.
Since founding his party, Gantz has emerged as the most serious challenger to Netanyahu, who has been prime minister since 2009 as well as between 1996-1999.More news: Brewing storm could bring dumping of snow