The 72-hour ceasefire Hamas reached with Israel on Sunday "is one of the ways or tactics to ensure successful negotiations or to facilitate the delivery of humanitarian aid to Gaza," said Meshaal, according to Maan news agency.
The final "goal we insist on is having the demands of Palestinians met and the Gaza Strip exist without a blockade".
"We insist on this goal. In the case of Israeli procrastination or continued aggression, Hamas is ready with other Palestinian factions to resist on ground and politically and... to face all possibilities," he said.
The remarks by Meshaal, who lives in exile in Qatar, come as Israeli and Palestinian negotiators on Sunday accepted an Egyptian proposal for a 72-hour ceasefire in Gaza from one minute past midnight local time.