It is therefore hardly surprising that in 1900 as a twenty-one year old George's first senior club was The Spiders, as they finally joined the League. However, in the best part of two seasons at Queen's Park he, a right-half, hardly got a look in, the position filled by James Irons', five years his senior. Indeed, it could have been at that point the younger man, working outwith football as a Timekeeper, might have decided it was not to be, stepping down a level as still an amateur or even away. Yet, he clearly back himself. He took a trial with Dundee, was immediately signed as a professional, became an ever-present, attracted interest from other clubs and in November 1902 signed to Rangers.    

At Ibrox as a replacement in the replay in 1893 so almost immediately he was to win a Cup-medal. However, that was to be followed by two unsuccessful finals, sweetened somewhat by a single cap before first, and then in 1905 immediately after the second he was on his way South. There was a season at Middlesbrough, in which the club just held on to its place in the top-flight, and then three at Chelsea as it was promoted from the second and then consolidated. However, by then George was about to turn thirty but with not much left in the legs and playing mostly in the reserves. And although he would manage another season before hanging up his boots, it would be only for Glossop and a division down. 

George Henderson then on footballing retirement would from 1911 settle in Birmingham. There he stayed in Stechford in the east of the city. He worked as a salesman in engineering. He never seems to have married. And it was there too that he quietly passed away in early 1930 at the age of just fifty.