UTD have money to spend, and have either chosen not the spend it this window, or don’t trust the manager enough to spend it, based on the vibes he’s been given out for the past 12 months. However, they have spent a lot of money in recent windows, whether on sky high wages and signing on fees such as Sanchez and Ibrahimovic or through Lukaku, Matic, Mata, Pogba, Martial, Falcao, Di Maria, Mikhataryan, Lindelof, who all cost decent amounts, with a few records thrown in.
Mourinho and his attitude, has created an issue for him in my opinion, and wallets won’t be opened as much when a managers future is on the line... he has a history of throwing his toys out the pram whether he likes it or not, and the current mindset isn’t helping to dispel that.