Manchester City
In 2000, Haaland left Leeds to join Manchester City for a fee of £2.5 million. In April 2001, during a match against Manchester United, Roy Keane tackled Haaland, kicking him high on his right knee, for which he was immediately sent off. Of the incident, Haaland said: "I'm only glad my leg was off the ground, otherwise he would have done me a lot of damage". Keane was subsequently fined £5,000 and received a three-match ban. In his autobiography, published a year later, Keane stated that the tackle was a pre-meditated, deliberate act of vengeance against Haaland for the on-field criticism he received from him three and a half years previously. After this revelation, Keane found himself subject to an FA inquiry. He claimed inaccurate paraphrasing by his ghostwriter but received an additional five-game ban and a £150,000 fine for bringing the sport into disrepute. Following the tackle, Haaland had initially claimed Keane would not dare to look him in the eye, and he once said: "I really dislike [Manchester] United and I can't stand their players".
At the time of Keane's tackle, Haaland's left knee was already giving him sufficient problems for him to have to play with strapping around it. After the tackle, Haaland finished the match and played a midweek friendly for Norway coming off at half-time, and the next league game, coming off in the 68th minute. That summer, he underwent surgery on his left knee but only managed a further four substitute appearances the following season, and finally retired in July 2003 after failing to recover full fitness. Haaland was originally contracted with Manchester City until the end of the 2004–05 season, but in his contract, it was stated that City could terminate the contract if medical conditions indicated that he could not play first-team football again, and decided to use this option.
Following the release of Keane's autobiography in 2002, Haaland and Manchester City stated that they were considering taking legal action against Keane. However, it emerged that Haaland had stated on his website that he had been playing with the injury to his left knee for a few months, that his left leg did not receive a knock in the game (Keane kicked his right thigh), and that Keane did not cause his long term injury. Legal action was dropped in February 2003 after the club reviewed the medical advice.