SiMamu
Part time Leeds fan
Koscielny's contracted to 2019, not 2017. He signed the contract in 2014.
http://www.givemesport.com/463034-laurent-koscielny-agrees-new-fiveyear-arsenal-contract
http://www.givemesport.com/463034-laurent-koscielny-agrees-new-fiveyear-arsenal-contract