Arsenal's Calum Chambers not in starting lineup vs. Borussia Dortmund

Tonsillitis could not come at a more inopportune time for Calum Chambers.

The Arsenal defender, who was expected to be leaned upon heavily in the extended absence of Mathieu Debuchy - out with an ankle injury - is not in the starting lineup for today's Champions League match against Borussia Dortmund.

As was rumored earlier in the day, 19-year-old Spaniard Hector Bellerin will make his Champions League debut in place of Chambers.

Quite a stage for the teenager.