Madrid: Arsenal travel to the Riyadh Air Metropolitano to face Atlético Madrid in the crucial first leg of the Champions League semi-final. The Gunners, who remain unbeaten in Europe this season, are aiming to reach their first final since the 2005-06 campaign and continue their pursuit of a domestic and European double. Meanwhile, Diego Simeone's Atlético are banking on their formidable home record to gain a vital advantage in what promises to be a tense, high-stakes tactical battle. With key injuries impacting both squads, every detail will matter in the Spanish capital.According to Islamic Republic News Agency, Atlético Madrid's coach Diego Simeone is dealing with significant selection issues. Nico González is out with a muscle injury, and both Pablo Barrios and José María Giménez are sidelined. Ademola Lookman and Dávid Hancko are doubtful, though Lookman may return. Julián Alvarez, despite a recent minor injury, is expected to start. On the Arsenal side, Mikel Arteta confirmed Kai Havertz's absence due to a muscle injury. Jurriën Timber and Mikel Merino are long-term absentees, while Eberechi Eze is fit. Defenders Riccardo Calafiori and Bukayo Saka are available.Arteta expressed the team's determination following a win over Newcastle, highlighting their energy and confidence. He stated that reaching the semi-finals for two consecutive years is an honor and emphasized their intent to dominate and win the match. Arteta acknowledged the challenge but affirmed Arsenal's capabilities in Europe.The expected lineups see Atlético Madrid in a 4-4-2 formation and Arsenal in a 4-2-3-1. The match will be held at the Riyadh Air Metropolitano, with Danny Makkelie officiating and Dennis Johan Higler on VAR duty. The game kicks off at 8 p.m. BST and can be viewed on various networks across the UK, US, Canada, and Mexico.Atlético's recent form shows seven defeats in their last nine matches, including a Copa del Rey final loss, though they recently won against Athletic Club. Arsenal ended a winless streak with a victor y over Newcastle and remain in the Premier League title race. In the Champions League, Arsenal have 10 wins and two draws, while Atlético have seven wins, two draws, and five losses. Arsenal's defense has been strong, while Atlético have shown offensive prowess.This encounter is a battle of contrasting styles. Atlético rely on home advantage and experience, despite defensive issues, while Arsenal bring a solid European record and defense but face fatigue and attacking challenges. Arsenal aim to overcome past away struggles in Europe for a positive result before the return leg in London.