Mikel Arteta revealed that he was “hopeful” of having Kai Havertz available for the second leg of Arsenal’s Champions League semifinal against Atlético Madrid on Tuesday night. The ephemeral forward has an enormous impact on the entire team’s forward line when deployed as the sole striker, boasting a skillset laced with more craft and cunning than Viktor Gyökeres’s rugged brand of crash-ball. Unfortunately for Arteta, he simply hasn’t had his first-choice center forward available enough. Havertz has already missed 40 games through injury this season, starting just once across the entire Champions League campaign. After suffering another setback in last weekend’s narrow victory over Newcastle United , the German once again missed the first leg against Atlético in Madrid. However, there is newfound optimism that the 26-year-old will be available for the return fixture. What Injury Does Kai Havertz Have? Kai Havertz had to come off in the first half against Newcastle.…