Dallas Cowboys quarterback Tony Romo practiced Friday for the second straight day and is officially listed as probable for Sunday’s game against the Jacksonville Jaguars in London.

Romo, who injured his back for the third time in the last 18 months nearly two weeks ago, sat out last week’s loss to the Arizona Cardinals and skipped the team’s first practice in London on Wednesday, but he participated in drills Thursday and Friday.

Romo gave a thumbs up as he stepped on to the team bus after Friday’s practice,.

Coach Jason Garrett spoke to the media before Friday’s practice.

“He looked pretty comfortable to me,” Garrett said of Thursday’s session. “Clearly, he wanted to get the blood flowing through his body and get his movement back both in the pocket and also throwing the football, and he had a pretty good day yesterday.”

The Cowboys (6-3) play the Jaguars (1-8) at Wembley Stadium in the last of three regular-season games in London this year. The Cowboys have lost their last two games. Backup Brandon Weeden started last week against the Cardinals.

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

Garrett said he still hasn’t made a decision on who will start Sunday.

“We’ll take today, we’ll see how he feels after yesterday’s work,” Garrett said, “and hopefully he can practice the way we need him to practice today and just take it right up until game time.”

Romo has passed for 1,998 yards with 15 touchdowns and six interceptions in eight games.