Career
He turned professional in 1938 and made his 1st team debut in the 3 games of the expunged 1939/40 season. Dennis Grainger guested for Millwall, Sheffield United, Rotherham United, Doncaster Rovers, Lincoln City and Walsall whilst in the R.A.F during World World War World War II He made his 2nd debut in the Football League for Leeds United in the 1st season after the war - 1946/47 (but had played in the F.A.Cup the previous season for Leeds United. Dennis Grainger to Wrexham in December 1947 and he played in the 1949/49 Welsh Cup Final.
Dennis League career ended at Oldham Athletic in season 1951/52.
He made a total of 138 League appearances. He finished his career with Bangor City in Wales.