have seen their opening bid for Inter Milan goalkeeper rejected by the Serie A giants.
The Red Devils placed a bid of around £34.4m, with bonuses that could have taken the deal to around £38.5m.
However, this is below Inter Milan’s asking price of £44m and the Italians rejected the offer, according to Gianluca Di Marzio.
The Cameroonian is ’s first choice to replace , who is a free agent after his contract expired on July 1st.
Though United remain in talks with the Spaniard over a new deal at the club, it remains unlikely that De Gea will agree new terms.
De Gea had been United’s highest earner on £375,000-a-week and his departure would free up significant funds on the wage bill.
But United will have to increase their bid for Onana if they want to sign the former Ajax star and Inter want the matter resolved within a fortnight.
United expect to complete a deal for Mason Mount this week after the midfielder was at Carrington on Monday to undergo a medical with the club.
Chelsea accepted a £55m bid from United last week and Ten Hag will have just £65m left of his budget once Mount is through the door.
United will therefore have to raise significant funds through player sales for the Dutchman to land a top striker in the window.
Ten Hag is desperate to sign a new centre forward and will listen to offers for Dean Henderson, Harry Maguire, Alex Telles, Donny van de Beek, Eric Bailly, Anthony Elanga, Fred and Anthony Martial in order to raise funds.
, .
,  and .