text: In 1882, Watson moved to London and became the first black player to play in the English Cup when he turned out for Swifts. In 1883, he was the first foreign player to be invited to join the leading amateur club in England, the Corinthians. His time there included an 8–1 victory against Blackburn Rovers, who were at that time the English Cup holders. He also played for other amateur English clubs, including Pilgrims, Brentwood, and London Caledonians. As one of the 'Scotch Professors' of the age who introduced a more sophisticated and effective passing game into England where individualistic dribbling had previously been used, Watson was described by the founder of the Scottish Football Museum in a 2021 report as "the most influential black footballer of all time. There is nobody that comes close".
  The colour of his skin was of no significance to his peers, and there is no specific historical record of racism on the part of the Scottish Football Association, although in an 1885 profile, mention was made of him "On more than one occasion being subjected to vulgar insults by splenetic, ill-tempered players". One match report is more interested in Watson's unusual brown boots rather than the customary black boots of that time. As written in the minutes, before one match where Watson was injured and unable to play, an SFA vice-president said if Watson had been fit he would have happily drugged a fellow Scottish international to give Watson his place.  He played his last match for Queen's Park in 1886.
  Paul McDonald, writing for the BBC, noted: "Payments to players had been made legal in England in 1885 and professional footballers were paid decent salaries for that time. Ironically this attracted many Scottish players southwards to ply their trade in England, whereas in Scotland the game remained, in theory anyway, an amateur game until 1893."