SummaryManchester United's potential sale could offer significant upside for investors, with Qatari banker Sheikh Jassim bin Hamad al-Thani's rumored offer valuing the club at around $5.25 billion.INEOS founder Sir James Ratcliffe is also a contender, with his bid valuing the club between $6.2 and $6.8 billion, though he is only looking to acquire just over 50% of the club.While there are risks involved, the potential upside for investors outweighs the short-term risks, with a successful sale possibly doubling their investment.Manchester United's Old Trafford stadium P. KijsanayothinManchester United plc $Manchester United PLC(MANU)$ is one of the best known names in global football ("soccer" to Americans). On the pitch, the team's performance has