Liverpool star cost Arsenal £1.4million in transfer fees due to 'mad' contract clause

Alex Oxlade-Chamberlain became the Gunners' most lucrative sale in 2017 when he made the switch to Anfield, with Arsenal forced to pay out a sizeable sum to Southampton

source https://www.liverpoolecho.co.uk/sport/football/football-news/liverpool-arsenal-alex-oxlade-chamberlain-32356755