The concern surrounds a cargo vessel which he says is integral to the economy of Tobago and impacts the economy of Trinidad as well.
He says that a contract for its continued operation in Tobago has not been signed yet and this can create a major issue.
Duke was speaking in a televised interview this morning.
On Thursday Duke is expected to make his debut presentation at the Tobago House of Assembly.
He has put Tobagonians on alert to give their support at midday on Thursday for the signing of the contract to keep the vessel running.