Diego Costa will start on the bench in Atletico Madrid's Europa League semi-final against Arsenal where Mesut Ozil is back in action for the hosts Former Chelsea striker Costa was a thorn in the Gunners' side during his time in the Premier League, scoring three times and finding himself at the centre of some on-field flashpoints. A hamstring injury has kept the 29-year-old sidelined since the second leg of Atleti's quarter-final against Sporting CP a fortnight ago and Kevin Gameiro partners star forward Antoine Griezmann in attack. Griezmann and Gameiro are two of the three French strikers on display, with Alexandre Lacazette leading the line for Arsenal. | STARTING LINE-UP Check out who’s going to start in tonight’s @EuropaLeague semi-final against @Arsenal! #ArsenalAtleti #AúpaAtleti #UEL pic.twitter.com/eH2onqX7YS — Atlético de Madrid (@atletienglish) April 26, 2018 Like Costa, Ozil has also not featured for the past two weeks but the Germany playmaker is back from a bout of illness to bolster boss Arsene Wenger's bid for a farewell trophy.