The Glazer family announced last November that they were exploring "strategic alternatives" for the club, including a possible sale and were open to fresh investment.
Manchester United's U.S.-listed shares rose 9.5% to $20.10 in early trading on Friday.
Manchester United generates more revenue and has a larger fan base than its London rival.
The Glazer family has faced intense criticism from fans over its handling of this key part of the club's operations.
The six descendants of American businessman Malcolm Glazer, who died in 2014, currently control 96% of Manchester United's voting stock.
Persons:
Glazer, Jim Ratcliffe, Ratcliffe, Sir Alex Ferguson, Richard Arnold, Roman Abramovich, Todd Boehly, Phil Noble, Malcolm Glazer, Ineos, Eva Mathews, Matt Scuffham, Arun Koyyur, Susan Fenton
Organizations:
Manchester, soccer, Sky News, Old, Manchester United, Premier League soccer, Chelsea, U.S, Clearlake, REUTERS, Reuters, Tampa Bay Buccaneers, Forbes, Ligue, Nice, Swiss Super League, FC Lausanne, Racing Club Abidjan, Ivory Coast Ligue, Grenadiers, Thomson
Locations:
Old Trafford, Manchester United's U.S, London, Manchester, Britain, Ineos, British, Bengaluru