The Arsenal duo of Gabriel Magalhaes and Jakub Kiwior were missing from their final training session before Sunday’s Premier League home game against Aston Villa. The Gunners go into the game sitting in second place on the table, following Manchester City’s 5-1 demolition of Luton Town on Saturday. But Mikel Arteta’s men have the chance to reclaim top spot with victory over Villa. However, Arteta appears to face two defensive injury headaches for the game against Unai Emery’s side. Gabriel, who has been nursing an Achilles issue over the last month, was absent from the training session on Frid…