straight to your inbox every day, freeRio Ferdinand has had his say on Manchester United's summer transfer business and believes Ole Gunnar Solskjaer will have been left frustrated by the club's failure to land his top target.United signed Donny van de Beek, Alex Telles, Edinson Cavani and Facundo Pellistri this summer, as well as securing an agreement to land Amad Diallo in January, with four of those deals finalised on deadline day.