Manchester United has declined to be drawn on a report the controlling Glazer family are planning to sell as much as a 25 percent stake in the English club on the market. Britain's Sunday Mirror newspaper quoted an unnamed banking source as saying the proposal was being considered by the owners in order to clear some debt. “We don't comment on speculation,” a spokesman for the clubsaid. The American Glazers have been unpopular with many fans since buying the club and taking it off the stock market in 2005.