From Angel Di Maria to Mario Balotelli, today we look at eight transfers in recent history that failed to work out.
There have been quite a few high-profile moves across Europe during this transfer window, and while it is far too early to judge how the likes of Paul Pogba and Andre Gomes will do at their respective new clubs, we looked at a few other big-name stars whose moves failed.
There was a sense of hope when Angel Di Maria signed for Manchester United in 2014 as the Old Trafford faithful had seen the damage he was capable of causing during his time with Real Madrid.
However, the Argentine's United career never really took off, and he was sold by manager Louis van Gaal the following season.
Bastian Schweinsteiger has had a similar fate at the Red Devils, and it has become increasingly unlikely that he will feature under new manager Jose Mourinho this season, which could lead to an exit.
Jackson Martinez spent just a few months at Atletico Madrid after he left FC Porto, while Manchester City's Wilfried Bony has not been a regular starter since leaving Swansea for the Citizens.
Now on loan at Roma, Thomas Vermaelen's short spell with FC Barcelona was riddled with injuries, while Mario Balotelli's 2014 move to Liverpool turned out to be a risk that was perhaps not worth taking.
Do you think there are any transfers this season that might not work out? Let us know in the comments section below.