He said: “If Brexit wasn’t delivered, then I would have to think seriously about plunging back in. But I hope I don’t have to.”
Earlier this morning he Tweeted: “Starting to detect a lot of frustration out there from the 17 million who voted Leave. Government need to get on with it and deliver Brexit.
“Brexit must mean end to free movement, out of single market & taking back our territorial waters. Anything less would be betrayal.”
Ukip has been in turmoil since Mr Farage stood down, with a controversial party leadership campaign marred by accusations of a fix.
Frontrunner Steven Woolfe was blocked from running after allegedly submitting his paperwork just 17 minutes late.