William Saliba is out for Arsenal's clash against Chelsea, a significant blow for the Gunners. Here's what you need to know:

• Injury News: Saliba's injury leaves a gap in defense.
• Team Changes: Mosquera and Hincapie are slated to start in his place.
• Sources: Updates from Arsenal.com and NBC Sports provide insights on Saliba’s condition.

Read on for the full story.