The 26-year-old Henderson joined United as as a 14-year-old but never became a regular with the first team, having had six different loan spells since 2016. He made a total of 29 appearances for United in all competitions.
Palace reportedly paid an initial transfer free of 15 million pounds for Henderson.
“I’m absolutely delighted and buzzing to be here. I can’t wait to get started," Henderson told the Palace website. “There’s something being built here, and I really want to be a part of it.”
AP soccer: https://apnews.com/hub/soccer
The Associated Press