It is thought that Kier has already suspended a contracts manager and a surveyor as part of its investigations into potential fraud on the 'responsive landlord repairs element' of Harrow's housing repairs budget, worth ВЈ2.5m a year.
The work forms part of Kier's ВЈ125m, five-year contract to repair and maintain 6,000 council houses, schools and other council buildings.
Kier and Harrow Council have been conducting the joint investigation into allegations of fraudulent invoices and kickbacks since July, when subcontractors complained to the council.
In a statement, a Kier spokeswoman said: "Up to this time, these allegations remain uncorroborated and it would be irresponsible to make any comment until all investigations are complete."
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