6. Wilfried Zaha
In a two-way chase between Manchester United and Arsenal in January, Crystal Palace starlet Wilfried Zaha eventually ended up moving to Old Trafford. Despite being an Arsenal fan and more than willing to move to the Emirates Stadium, it is widely thought that United simply tried harder to land the talented youngster. Although we are yet to see what Zaha is capable of in the Premier League, it looks like once again Arsenal have missed out on a top player when they probably could have signed him with a bit more effort.