"There was a little something in there that they could fix up and clean up for the long haul," Carroll said. "It was really a good decision."
Branch, 30, shredded his left knee on a snowy field during a January 2008 playoff game at Green Bay. He had reconstructive surgery one month later.
Branch had a follow-up procedure in March 2009, but he downplayed it as a minor clean-out that he said is common following knee reconstruction.
Carroll said Houshmandzadeh's injury had bothered him since the end of last season and didn't improve. He said Houshmandzadeh should be back on the field in a couple of weeks.
Houshmandzadeh had 79 catches in his first season with the Seahawks. The team signed him as a coveted free agent last spring.
Houshmandzadeh is on the sideline tutoring second-round draft pick Golden Tate during this weekend's mandatory minicamp.
Tate was brilliant at times in Friday's practice, once leaping and reaching high to snare a deep pass over the middle from QB Matt Hasselbeck.
"They drafted me for a reason," the Notre Dame star said. "I didn't come (here) to not play."
Copyright 2010 by The Associated Press