However, Siemens was was unable to comment when asked directly if Clegg's comments were true.
The UK government, including prime minister David Cameron, has been attempting to persuade the German manufacturer to invest in Green Port Hull, which was granted planning permission in 2012.
Like other offshore turbine manufacturers considering building facilities in the UK, Siemens has been affected by uncertainty surrounding the country's energy policy.
A statement from Siemens said: "We continue to progress our plans for Green Port Hull. Our discussions with government, our customers and Associated British Ports are ongoing."
Hull is one of the poorest areas in the UK. Clegg told the Hull Daily Mail that if the turbine manufacturer did "sign along the dotted line" it would have a "dramatic effect" on the Humber, transforming it into a "real hub" for offshore wind.
Former Labour minister Lord Mandelson, who now holds the ceremonial post of Hull High Steward, said he was "80% certain" the planned turbine factory at Green Port Hull would go ahead.
Cameron and Clegg have been meeting with Siemens and other stakeholders.
Siemens stated the new facility will create many new jobs in the local area, with the potential for hundreds more in the supply chain. Jobs at the facility will include shop floor, engineering and project management.
The port complex is next to a deep-water channel, making it well positioned for the installation and dispatch of offshore wind turbines.