Sheikh Jassim has been exploring the idea of buying Manchester United for almost 13 years.
The Qatari has made an offer for United in the region of 4.5bn.
The Athletic reports Sheikh Jassim was among the Qatari officials who attended a meeting with a group of wealthy fans called the Red Knights back in 2010, when they were trying to fund a possible takeover from the Glazers.
At the time the Glazers were subjected to protests and chants from United fans, who formed a green and gold movement to vent their anger - despite the success of Sir Alex Ferguson's side in the years following the controversial 2005 takeover.
Sheikh Jassim was among those present for talks with the Red Knights and members of the Qatari royal family, which took place several years into his current position as chairman of the Qatar Islamic Bank.