Sega Publishing and Sports Interactive (SI) collaborate to release a new version of the football management simulator each year.
And despite using the club's name every year since the original Championship Manager game in 1992, United have now decided to sue the makers - report the Press Association.
United are also arguing that their trademark has been infringed due to the use of an unofficial crest to represent them - a basic red and white crest.
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Sega and SI say the use of the club's name is "a legitimate reference to the Manchester United football team in a football context".
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