Yes. For calls 2018, you may exclude up to 3 reviewers. This request is done at the time of the proposal submission via the online administrative forms. However, the request will only be accepted if the proposal can still be evaluated by other reviewers having the same expertise. Additionally, based on data protection regulations, an excluded expert may be granted access to all data linked to his/her exclusion.
Please note that the ERC might change the number of reviewers to be excluded within the next Workprogramme.