British billionaire Sir Jim Ratcliffe is also expected to make a second offer for Manchester United next week after visiting the club on Friday.
The INEOS delegation spent six hours at Old Trafford and Carrington with meetings finishing at about 4pm.
Ratcliffe and INEOS are making no comment, and they will now go away and digest the information they received on Friday before making a new formal offer next week.
Ratcliffe, 70, flew in from Nice on Thursday and visited United’s management team at Old Trafford on Friday, alongside INEOS sport representatives.
He was photographed outside Old Trafford after meeting club executives – unlike Sheikh Jassim, who did not visit Manchester personally the previous day.