Sheikh Jassim Bin Hamad Al Thani will make his second bid for Manchester United on Wednesday evening.
Sources in the US say talks last Thursday in Manchester between Sheikh Jassim's Qatari delegation and United executives were positive.
His advisers are now working on putting together a new bid which is expected to be submitted by close of business on Wednesday.
There is also growing confidence among bidders that the Glazer family, who believe the club is worth at least £6bn, are willing to sell United.
