China's price regulator has expressed monopoly concerns over Mercedes activities in the country but the firm is not under investigation, one of the company's top China executives said on Tuesday.

Nicholas Speeks, China sales head at Daimler AG's Mercedes-Benz, told reporters the firm was also currently cutting service charges and prices of its spare parts by 20 percent.

Bloomberg reported Friday citing unnamed sources that the National Development and Reform Commission was probing practices at Daimler AG's Mercedes-Benz as well as other foreign automakers to see whether prices of spare parts are being artificially boosted.