The Scotland Under-19 international has come through the ranks at Tannadice after joining United at under-12 level.
Manager Peter Houston told the club`s official website: "Marc is a tremendous prospect, someone we have high hopes for. I'm delighted for him as he is not only a very promising goalkeeper but he has also shown me that he has the right attitude to make a successful career for himself here at Dundee United."
Source: PA
Source: PA