A spokesperson from Boskalis told the AFN news agency there were no talks over an alliance involving harbour towage operations Smit Lamnalco and Svitzer.
The company was reacting to a report in MergerMarket magazine that a European tie-up was on the cards.
Earlier this month, Boskalis said it had acquired a 14.8% stake in offshore vessel owner Fugro, but added it had no plans to make an offer for the company.