Mundo Deportivo says United have had a cheeky offer of just £10m for Trippier rejected by Atletico - who paid double that for him two summers ago.
The England right back is one of Ole Gunnar Solskjaer's key targets this summer but United have been told they won't be able to get him on the cheap and will have to offer significantly more if they want to sign Trippier.
Reports last week claimed that Trippier, who won LaLiga with Atletico last season, is keen on a move to United and is already house hunting in Manchester in anticipation of joining them.
But United's opening offer fell way short of Atletico's valuation, with the Spanish side telling the club Trippier can only leave if his £35m release clause is met.
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