Alan Shearer has admitted that watching one Arsenal star fail to play at his expected standards at Euro 2024 is leaving the England legend rather ‘frustrated’ this summer. The European Championship has proven to be a strong opportunity for Mikel Arteta to scout some of their transfer targets. Turkey star Ferdi Kadioglu is the subject of a bid from Arsenal. The left-back’s teammate Arda Guler has also drawn Arsenal’s interest after his wonder goal. But Euro 2024 has not been a happy hunting ground for every Arsenal player in Germany so far. While Kai Havertz has thrived for Germany, Bukayo Saka…