Manchester United, Chelsea, and Aston Villa have been very busy in the transfer window with other top teams such as Arsenal and Liverpool struggling.
The season is drawing closer and closer and the top teams will be looking to fill their squads so that they are fully prepared for the new season.
As the transfer market can be difficult to negotiate, free agents are always worth looking at a cheap deal on a player that could still be of significant value.
Arsenal, Manchester United, and Chelsea are all looking for help at the left-back position so it may be worth looking at some of these free agents to help shore up the position.
Here are the top five most valuable free-agent left-backs that these clubs could sign.