The Ineos founder held the first of what are expected to be a number of informal meetings at Old Trafford on Tuesday after flying into Manchester.
Ratcliffe is expected to spend a few days at the club this week when he is also due to meet with Ten Hag and the United players at their Carrington headquarters.
Ineos have been given full control of football operations by the Glazer family as part of the deal that will see them take a 29 per cent stake in the club subject to Premier League approval.
Under the terms of the agreement, United’s current hierarchy must run any big football decisions, such as signings, loans and changes to personnel including the manager, by Ineos while the deal awaits the green light.
That is not expected to come until next month but Ineos want to take as many soundings as possible in the interim as part of a scoping exercise.
Ten Hag’s squad were on a day off on Tuesday but are due back in on Wednesday when Ratcliffe plans more talks with staff.
Sir Dave Brailsford, Ineos’ director of sport, had met with Ten Hag and United staff at Carrington on Sunday as part of a guided tour by interim chief executive Patrick Stewart and football director John Murtough.
Ineos are expected to appoint a new director of football in a bid to dramatically improve United’s poor recruitment record.
Ten Hag has a joint veto on transfers with the recruitment team as part of his deal as manager and is understood to be keen to ensure that remains the case, despite a litany of poor signings during his 19 months in charge.
Twelve months after signing Netherlands striker Wout Weghorst on loan from Burnley, Ten Hag is again on the lookout for a centre-forward this month. Unless United can raise considerable funds through sales, Ten Hag is likely to be restricted to another loan deal.