Another reason Manchester United are looking for a top midfielder is because they are in crisis in midfield, Manchester United have lost four players who have been in and out of the first team. Lingard, Juan Mata, Nemanja Matic and Paul Pogba will certainly not appear with Manchester United again because their contracts have expired. So, Manchester United really have to prioritize strengthening the midfield in the transfer market by bringing in some new players.
This means Manchester United must look for four other talented players to replace Lingard, Juan Mata, Nemanja Matic and Paul Pogba who will not strengthen the Manchester United team again next season, because if only De Jong to replace the four players whose contracts have expired will also not enough for Manchester United. And it looks like Manchester United should focus more on finding some new players to strengthen their midfield in the current transfer market.
Why it changed to be Chelsea that are leading the race for Rafinha is what I don't know because it was Arsenal that was pushing forward for his signature,and have had about two bids refected by Leeds United,but the moment Chelsea came in and offered more money,they were in pole position to land the Brazilian.Rafinha is a nice dribbler and a good player that has that ability to score goals. Arsenal would have been the best club for him.