Irish construction services group Siteserv has gained overwhelming shareholder approval for its sale to one of Denis O’Brien’s investment firms.

Dublin-based construction services group Siteserv has described as “spurious and vexatious” the claims that an international rival was ignored as a potential bidder for the firm.

An international construction services group, which claims its attempts to buy Irish counterpart Siteserv were ignored, is considering lodging a complaint to the Competition Authority if the sale of the company goes through this week.