"We saw Vick limping around. Vick's not gonna last," Casserly, a former NFL general manager, said Tuesday on NFL Network's "Around the League Live." "He's running the ball in this offense, he's not just handing it off."
Durability always has been an issue for Vick. The 33-year-old quarterback has missed 12 games over the past three seasons. After Vick came up limping following a 36-yard run in the fourth quarter, there was cause for concern.
"One of the things that I was concerned about running this type of offense in the National Football League -- in college, you have so many players," Fletcher said. "You have over 100 players on your football team, but in the National Football League, you only have 53 players. ... Will they be able to sustain this type of pace?"
It's a legitimate question by Fletcher, who has appeared in an NFL-high 241 consecutive games but said he played "the longest first quarter of my life" Monday night.
"I just hope there's not too many other offenses coming into the league like the Philadelphia Eagles (or) I'm gonna run out of this league pretty soon," Fletcher said.
The nature of Kelly's offense likely will make it harder for Vick to play all 16 games, something he hasn't done since 2006.