Sheikh Jassim is becoming concerned over the silence from the Glazer's camp regarding Manchester United's sale.
The Qatari has been in contact with the Glazers for over nine months.
After offering 6bn in May, Sheikh Jassim has not heard from the Glazer family since, says the Manchester Evening News.
It's also emerged insiders at Raine Bank, which are handling the sale, are becoming increasingly convinced that United will not be sold.
There's claims shareholders plan to pressure the New York Stock Exchange to demand a decision from the Glazers given the fluctuating stock price.