Aston Villa head to Amsterdam on Thursday evening to face Ajax in the first leg of their UEFA Conference League round of 16 tie. Unai Emery has several well-documented injury issues to contend with. Diego Carlos is still out with a hamstring problem he sustained during training. At the very least, Boubacar Kamara is out until the start of the new season after damaging his ACL against Manchester United. Emi Buendia and Tyrone Mings are long-term absentees from the Spaniard’s plans. Jacob Ramsey is also doubtful after picking up an injury during the Villans’ weekend win over Luton Town. It’s a s…