In a speech to the CER think-tank later, the deputy prime minister will launch an attack on his rival, saying: "Nigel Farage and deputy leader Paul Nuttall rarely turn up to vote in the European Parliament, despite being happy to take their taxpayer-funded salaries."
In a speech to a pro-European think-tank, the Centre for European Reform, in London the deputy prime minister will say that Farage is happy to claim his "taxpayer-funded salary" while failing to turn up for many votes in the parliament.
In a speech to the CER today, in which he declared that pro-Europeans were best placed to modernise the EU, the deputy prime minister said Cameron would only achieve a "little tweak here, a little tweak there".
Having challenged Mr Farage to a debate on the EU before key elections in May, Mr Clegg will admit during a speech to the CER that the EU has faults and should be "pushed back". He will call for the "wasteful" second parliament in Strasbourg to be binned and for more progress developing the single market.
In a speech today, Mr Clegg told the CER: "You would have thought that if your world view was based on the idea that it has been bad for Britain for us to be part of the EU, a party such as the Ukip would have used its berth in the European Parliament to find every possible opportunity to promote reforms that create British jobs."
The CER commission on the UK and the single market