Vaiko called on Cravinho who is heading a delegation of ambassadors representing various EU member countries currently on a three-day visit to Tamil Nadu and Puducherry.
He discussed a host of issues including the plight of Tamils in Sri Lanka and the "need for a referendum" among them in the island nation.
"The help and contribution of European Union countries in holding a referendum on the Tamils issue in Sri Lanka is very essential," he said.
The MDMK chief also gave compact disc copies of his speech on the travails of Tamils in Sri Lanka.