Manchester United have now entered the race for a Premier League midfielder who is also thought to be on Mikel Arteta’s radar at Arsenal. Both United and Arsenal find themselves searching for a new number six, someone who can operate just in front of the defence. Arsenal only signed Declan Rice a year ago, but his forward progression to a more attacking role has created a new vacancy – one Jorginho can not fulfil alone. And in United’s case, Erik ten Hag could still sanction departures for both Casemiro and Scott McTominay before the month ends. Tottenham are interested in McTominay, and Fulha…