No. You should apply first for admission to the Doctoral Programme. Each application will be carefully studied by the professors in the field of specialization. Final decisions are made by the Doctoral Programme Board, so though you could identify potential supervisors doing research in your field of interest, it is not necessary to contact them to agree on supervision prior to application. Identifying the best supervisor is an essential and important milestone for your future PhD thesis: you will do it, with the Doctoral Programme support, during the first 6 months of the MSc degree.