Conversation so far:
When did Bobby Robson's club playing career begin?
Bobby Robson's club playing career began in 1950?
What teams did Bobby Robson play against during his club playing years?
Bobby Robson played against Manchester City Football Club and Burnley Football Club.

Question: What other teams did he play against after 1956?
Self-contained rewrite: What other teams did Bobby Robson play against after 1956?