Manchester United have reportedly been handed a boost to their proposed bid to sign Amadou Onana as they continue to scour the market for a potential replacement for Casemiro. United bought the rising Brazilian from Spanish giants Real Madrid two years ago for £60m plus add-ons.This comes after the club failed to pursue Frenkie de Jong when he chose to stay at Barcelona. United have brought in five midfielders – including Christian Eriksen on a free transfer and two on loan – since Erik ten Hag left Ajax to join the Premier League as a manager two summers ago. Reports from The Sunsuggest United remain interested in Onana as they look to add to the area. Arsenal and Chelsea are also believed to be keen, but counterparts Barcelona may not be able to offer Everton what they want from him due to financial reasons.United are ready to pay £52m for their man. Onana, 22, could be available next summer.Elsewhere, Football Transfers believe De Jong does not want to leave Barcelona next summer, although the Dutchman could eventually make a number of offers. Barcelona have been tipped to land the playmaker as United have long been interested after United failed to secure his signature last summer.Ten Hag managed the 26-year-old at Ajax and he was a key player in their famous run to the Champions League semi-finals in 2019. However, De Jong is said to want to stay put. Camp Nou after joining them in 2019.United spent over £180m on Andre Onana, Mason Mount and Rasmus Hojlund this summer. However, it has been a quiet January transfer window for the club, with the focus on sanctioning a loan move..