The former Muratti Vase-winning captain and the star Guernsey FC goalkeeper, who is currently injured, was announced in the new role yesterday.
Tardif, 38, will have the task of defending the Muratti, which begins with a semi-final trip to Alderney in the spring.
'I am very proud and extremely honoured to have been given the opportunity to help Guernsey try and retain the Muratti Vase as the island manager,' said Tardif.
'I look forward to the challenge ahead and can't wait to get started with my coaching team.'
Full story and more reaction will be in Thursday's Guernsey Press.