Ola Aina, 19, showed maturity beyond his years as Chelsea lost 2-0 to Rapid Vienna&nbsp; in their first pre-season fixture at the Allianz Stadion on Saturday.<br /><br />The England youth international replaced Baba Rahman in the line-up immediately after the intermission, and had to play as a left back, though he is predominantly a right fullback.<br /><br />In the closing minutes, Aina would have equalized when his long range effort hit the far post, with Rapid Vienna goalkeeper Strebinger well beaten.<br /><br />Chelsea manager Antonio Conte was impressed by the performance of the young Nigerian defender and gave him a thumbs up during the game.<br /><br />Super Eagles skipper Obi Mikel played 58 minutes of the contest while compatriot Victor Moses subbed out in the 80th minute.<br /><br />Igho Kingsley <br /><br />Photo Credit : chelseafc.com<br />