#3 Park Chu Young (2011-2012)
The most mysterious signing on this list, Park Chu Young was undergoing a medical with Ligue 1 Club LOSC Lille ahead of a proposed transfer from AS Monaco. Lille were waiting for Park to complete the second part of his medical when he became aware of Arsenal's interest. He departed from his hotel room, flying to London without finishing the medical.
How he must have regretted that decision. He made only one league appearance (as an 82nd-minute substitute) and scored one goal for Arsenal, in the League Cup against Bolton.
He came to England as Korea's best striker; one of the top goal scorers in Asia. When he left, his relationship with the Korean national team was in tatters. Talk about a bad career choice.