Saliba Returns to Training Ahead of Arsenal's Champions League Match

• William Saliba has returned to first-team training for Arsenal.
• Saliba's return comes ahead of Arsenal's Champions League match against Slavia Prague.
• Saliba had been sidelined with a back injury.
• Mikel Arteta now faces a selection dilemma with Saliba's return.
• Saliba participated in team training on Tuesday in preparation for the match.