The worst-case scenario for the Dallas Cowboys unfolded before our eyes on Sunday afternoon in Philadelphia. In an ugly game against the Eagles, the Cowboys lost more than they could've imagined, with quarterback Tony Romo suffering a broken left clavicle in the third quarter of Dallas' 20-10 win over the Eagles.

When Romo went down, the injury looked bad. The Cowboys didn't take long to confirm it either, running Romo through the X-ray machine, checking the bone and announcing the injury.

Here's five things you need to know about the injury:

1. Not the first time: Romo broke the same collarbone in 2010, when Michael Boley crushed him on a hit. The two moments looked similar:

The result was similar as well. When Romo suffered the injury in 2010 it was Week 7 and he didn't play another game. However, the Cowboys weren't even within striking range of the playoffs at 5-9 eight weeks after he suffered the injury then and decided not to try and force him back. 

2. Schedule: The only good news about this Romo injury is the Cowboys have a decent schedule for a stretch of time where Romo is out. Decent being the key word. 

Dallas plays the surprisingly good Falcons at home in Week 3, the surprisingly terrible Saints in New Orleans in Week 4 and the Patriots at home in Week 5 before their Week 6 bye, which comes at a huge time for them given the injuries.

After the bye Dallas gets the Giants in New York for Week 7, the Seahawks (gulp) at home in Week 8, the Eagles at home in Week 9 and the Buccaneers in Tampa for Week 10. 

Eight weeks out from now it's possible Dallas could be as well off as 5-4. If they can float around .500 until Romo and Dez come back a playoff run is possible.

They are in first place in the division right now and no one looks any better. 

3. Totally different offense: The team Dallas trots out in Week 3 against the Falcons will not look like the team they brought out in Week 3 last year. Not even remotely close.

It looked like Dez Bryant's injury -- a broken foot bone keeping him out for a TBD timeline -- was the worst thing that could happen to Dallas this season. But Romo's injury easily tops Bryant's. Losing your triggerman is about a devastating a blow as you can get.  

4. Weeden time: The Cowboys will turn to backup Brandon Weeden. This isn't necessarily new -- Weeden was forced into action in 2014 and played alright! The Redskins would ultimately beat the Cowboys in overtime in the game where Weeden played, but he wasn't terrible.

Weeden looked alright against the Eagles during Sunday's win too, going 7 of 7 for 73 yards and a late, game-sealing touchdown to Terrance Williams.

The former Browns first-round pick is 5-16 as a starter however. 

5. Timeframe for return: Eight weeks was the initial timeline bandied about for Romo's return. Romo wouldn't confirm any sort of timeline, but he does have experience with the injury.

“I’ll be back. It’s going to take a little bit of time," Romo said. "It’s a broken bone. It is what it is.”

Worth noting here is Aaron Rodgers return from a similar injury in 2013. Rodgers suffered the injury on Nov. 5 and was able to play again on Dec. 29. Reasonable comp for what Romo hopes to hit.

Nick Foles suffered a collarbone injury in 2014 and wasn't as quick to come back however. Foles, then with the Eagles, was hurt on November 5 and didn't play in a game for Philadelphia again. And, of course, Romo's own inability to return in 2010. 

Certainly the Cowboys hope for the former.