(Reuters) -Manchester United said it could coerce Jim Ratcliffe under certain circumstances to divest his ownership in the British soccer club at least 18 months after the billionaire closes his acquisition of a 25% stake in the company. It made the disclosure in a regulatory filing on Tuesday, but did not specify the circumstances. Manchester United’s filing also said that for three years after the tycoon’s deal closes any potential sale of the club solicited by its American owners, the Glazer family, will need to fetch at least $33 per share for Ratcliffe. A spokesperson for Manchester Unite…