It seems that every summer there is a messy and painful transfer saga that drags on throughout the course of the window. It usually involves Manchester United. Two summers of wrangling with Borussia

Manchester United find themselves in a complicated race to sign Sporting Lisbon striker Viktor Gyokeres this summer

A furious row has erupted between Sporting and Gyokeres this week, with his representatives accusing the club of breaking promises made last summer. Claims Sporting have agreed to