In August 2001, Sir Alex Ferguson signed French defender Laurent Blanc on a free transfer to replace Jaap Stam.
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Although Blanc faced intense criticism following five league defeats by December, his performances improved, earning him a contract extension and a Premier League title before his retirement.
The free agent market has also brought mixed results, as seen with the January 2015 signing of Barcelona goalkeeper Victor Valdes.
Valdes fell out with manager Louis van Gaal after reportedly refusing to play for the Under-21 team, leading to his exclusion from a pre-season tour and an eventual loan move to Standard Liege.
Current Free Agent Targets
As reported by Express Sport and TBR Football, United is currently linked with several current free agents and market opportunities to address squad depth, including Leon Goretzka, Dani Ceballos, Dani Carvajal, Raphael Guerreiro, and Dusan Vlahovic.
Goretzka is available after Germany's World Cup elimination by Paraguay, while Ceballos and Carvajal are free following their departures from Real Madrid.
Former Real Madrid defender Dani Carvajal expressed his desire to continue playing at the highest level following his departure from the Bernabeu.
"I'll keep playing, that's sure for me," Carvajal declared.
"We'll see what the best options are for me and my family, and based on that, I'll make the decision."
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In addition to veteran free agents, United is reportedly monitoring younger targets such as Brest left-back Bradley Locko, Monaco midfielder Lamine Camara, Lens midfielder Mamadou Sangare, and PSG forward Ibrahim Mbaye to align with the INEOS recruitment blueprint.