Following his success with Cavan, McDyer returned to Donegal and his native Glenties where he coached the Donegal senior team for a number of years. He also collected a Railway Cup medal with Ulster in 1942 and he also played in the same competition with Connacht.
McDyer managed Donegal. He was also an early influence on Jim McGuinness, Donegal's future All-Ireland winning manager. McGuinness described him as "an absolute gentleman to the fingertips, very well-educated [...] a very gentle, bubbly person".