"He's good," running back LeSean McCoy said. "Even when he came here it's hard to look at him as a backup because of (the) success he's had and experience. I think today wasn't really something surprising to the team."
"I think we'll do some damage if Nick can't go," McCoy continued. "He'll step in there and do a great job."
Sanchez, who also threw two interceptions, missed all of last season after tearing the labrum in his right shoulder in the preseason. He last played on Dec. 30, 2012, with the New York Jets.
Sanchez didn't waste any time in his Philadelphia debut, finding Maclin deep on his first play for a 52-yard gain. Five plays later, he threw a perfect pass to Jordan Matthews for an 11-yard touchdown to make it 14-7 in the second quarter.
He admitted to being a bit nervous before the throw to Maclin. Those butterflies dissolved after that strike.
"You want to get the first throw out of the way. And thanks to Chip we throw it right down the field," Sanchez said. "So that will get your nerves gone."
Coach Chip Kelly didn't provide many details of the injury to Foles, saying only: "He's in a sling right now, and that's all I got."
"It was a tough day, and obviously that falls on the quarterback in terms of not being able to get things started and accomplished," Fitzpatrick said.
Maclin finished with two touchdowns and 158 yards receiving and McCoy had 117 yards rushing.
Ryans tore his right Achilles tendon, a person familiar with the injury said. The person spoke on condition of anonymity because the Eagles didn't release details of the injury.
Houston's defense got to the quarterback early, with four sacks in the first half. The Eagles had allowed just two in the previous six games.
Whitney Mercilus sacked Foles twice in three plays, driving him hard into the turf on the second one to send the quarterback to the locker room.
Foster left late in the game and coach Bill O'Brien said he injured his groin and that he hoped he'd be OK after an extra week of rest with the bye next week.
Copyright 2014 by The Associated Press