Irishman Alan, who often watches Dundalk FC, has written two terrific books. Retired is an investigation into what happens when a footballer is no longer a footballer. The Transfer Market, meanwhile, is a slightly more fun collection of stories about every aspect of the window.
Find Retired here: https://www.amazon.co.uk/Retired-What-Happens-Footballers-Games/dp/1785311387/
Find The Transfer Market here: https://www.amazon.co.uk/Transfer-Market-Inside-Stories/dp/1785314521/
