Ten players Arsenal will regret not signing this summer, including Chelsea duo & Man United new-boy

8) Adrien Rabiot (Paris Saint-Germain)

Another midfielder who could have added something to this Arsenal team, Paris Saint-Germain somehow kept hold of French youngster Adrien Rabiot despite strong interest from the Gunners this summer. A top midfield prospect, the 19-year-old recently turned down a new contract at PSG and was said to be available for just £8m in the final few days of the transfer window. Still, a move never materialised and he will be free to talk to other clubs in January.