Dixon joined the team after he was let go by the Washington Redskins Saturday.
Feeley, who made the 53-man roster just yesterday, was the subject of trade rumors after the team signed Michael Vick.
"I knew there was a chance it might happen, but that doesn't make it any easier," Feeley told Reuben Frank of phillyburbs.com. "It's still sinking in. The thought of not being in Philadelphia, that's tough right now. I've been here for a while and even if you know it's possible, you really can't prepare yourself for something like this," said Feeley.
Feeley signed a three-year contract extension in 2007 that ran through next season, but the Vick signing put the nine-year pro’s future with the team in question, according to seattlepi.com.
The move leaves Vick as the team's third quarterback behind Donovan McNabb and Kevin Kolb. Vick isn't eligible to play until Week three.
The Eagles claimed rookie defensive tackle Antonio Dixon off waivers from Washington to fill the roster spot. Dixon signed as a undrafted free agent with the Redskins after four seasons at the University of Miami. He was cut Saturday.
Feeley started seven games in six seasons with the Eagles over two stints. He has thrown for 4,070 yards, 27 touchdowns and 29 interceptions in 23 career games, including eight starts with the Miami Dolphins in 2004.