Barnier's comments come four days after leaders of 27 EU nations met -- without British Prime Minister Theresa May -- and unanimously agreed on a tough overall strategy.
They also follow leaks about a disastrous dinner and exchanges involving May and European Commission President Jean-Claude Juncker, which has left the former battling to defend her Brexit strategy.
The row marks a dismal start to the process, although formal negotiations will not begin until after Britain's election on June 8, in which May is expecting to return to office with a stronger mandate.
Barnier, a French former European commissioner and government minister, will be presenting his formal recommendations for the talks based on guidelines agreed on at Saturday's EU 27 summit.
European commissioners will formally adopt his recommendations on Wednesday morning before he gives a press conference at 0900 GMT.
The EU 27 will then on May 22 give Barnier, 66, a formal mandate to conduct talks over the next two years with Britain.
Britain voted to leave the EU in June 2016 in a closely fought referendum.
And if the first contacts in Britain's divorce from the union it entered four decades ago are anything to go by, the negotiations will be difficult.
Barnier's recommendations, in an early draft seen by AFP, contain a demand for a lifetime guarantee of rights for EU citizens who have lived in Britain for five years.
They also echo the EU 27's insistence that talks on a future EU-UK trade deal cannot begin until Britain resolves the issues of "people, money and Ireland".
The EU says London must guarantee the rights of three million citizens living in Britain who are currently able to live, work and claim benefits there.
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