NEC3 ECC: Is the Employer entitled not to pay the Contractor amounts which is in excess of open market rates for amounts the Project Manager thinks was not competitively tendered?

If the Contractor selects a bid which amount is higher than open market price and the Project Manager thinks that price of the bid was not competitively tendered because the selected bid was the highest, can the Project Manager source out prices from open market (acquire offer/quotation from open market) and compare it with the Contractor's selected bid. If the selected bid is of higher price than the price of the quotation the Project Manager have sourced from open market, can the Project Manager remove the difference in amount between the two offer from the Defined Cost?