Bas Edo Kuipers (born 17 August 1994) is a Dutch professional footballer who plays as a left-back for Eredivisie club Sparta Rotterdam. Club career Ajax Born in Amsterdam, Kuipers was recruited into the youth academy of AFC Ajax in 2001 after having been discovered during the club's annual Talentendagen (Talent days) where young kids can come play football at Ajax for a chance to join the club's acclaimed youth academy. He joined the F1 Pupils selection at first from where he has advanced through every possible stage of the club's youth system. On 15 March 2013, Kuipers signed his first professional contract with Ajax, signing a two-year deal binding him to the club until 30 June 2015.