A groin injury plagued Henderson throughout much of the 1969–70 season, but he continued to play at the team's request. He finished with 20 goals despite playing the entire season with pain. The Maple Leafs offered Henderson only a small raise, arguing that he did not deserve more because his offensive production had declined. The contract offer and the team's indifference towards his injury left Henderson disillusioned with management's attitude towards its players. Healthy in 1970–71, he scored 30 goals and a NHL career-high 60 points.