City were once involved in something not unlike this. Spurs had an England international right-back called Bert Sproston, and when Spurs travelled up to play City at Maine Road, There were frantic negotiations, and Sproston signed for City on the morning of the game on November 5, 1938, for the then huge fee of £10,000.
So he turned out that afternoon for City against the former team-mates he had travelled up from London with.
City won the game 2-0, so it was a good investment.
Sproston lost his best years to the war, but continued to play until the 1949-50 season. He then became a physiotherapist with Bolton Wanderers - some older Bluemooners may remember him. He was a Cheshire lad from Sandbach, and didn't like the life in London.