Dallas Cowboys quarterback Tony Romo practices for the 1st time since arriving in London

Dallas Cowboys quarterback Tony Romo throws a football to a local school child during a community day event outside Wembley Stadium in London, England, Tuesday Nov. 4, 2014. The Dallas Cowboys will play the Jacksonville Jaguars in an NFL football game at Wembley Stadium on Sunday Nov. 9 (AP Photo/Tim Ireland) (The Associated Press)

Dallas Cowboys head coach Jason Garrett, left, and quarterback Tony Romo arrives at Gatwick Airport, England, Tuesday Nov. 4, 2014 prior to the NFL international series match between the Jacksonville Jaguars and Dallas Cowboys at Wembley Stadium on Sunday. (AP Photo/NFL UK, Dave Shopland) (The Associated Press)

LONDON – Dallas Cowboys quarterback Tony Romo has practiced for the first time since arriving in London, taking part in Thursday's drills.

Romo, who missed last Sunday's 28-17 loss to the Arizona Cardinals with his third back injury in the last 18 months, arrived with the team on Tuesday but skipped Wednesday's practice.

Dallas coach Jason Garrett says Romo is still not assured of starting on Sunday, when the Cowboys (6-3) play the Jacksonville Jaguars (1-8) at Wembley Stadium.

Garrett says "he has to be functional."

Romo has fractures in two small bones in his back. The injury is unrelated to a herniated disk sustained last year and to offseason surgery to remove a cyst earlier in 2013.

___

Online:

AP NFL website: www.pro32.ap.org and www.twitter.com/AP_NFL