Ole Gunnar Solskjaer understands fans' cries for further investment in the Manchester United squad – but pointed to the club's past mistakes in the market as reason for caution.
United have spent huge sums on star names over the past few years in a bid to relive the glory days enjoyed under the stewardship of Sir Alex Ferguson.
But the likes of Alexis Sanchez, Angel Di Maria, Romelu Lukaku and other big-money arrivals have failed to live up to their billing and have since been moved on for a loss.
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In comparison the Reds have been more subdued in the current window, with Donny van de Beek their only confirmed signing - although Edinson Cavani is set to complete a free transfer to add more muscle to their forward line.