"This is an amazing club and one that I am now proud to represent. I'm really looking forward to working with an unbelievable goalkeeping group, supporting each other every day to create the best training and playing environment for the team," Butland said in a statement on the club's official website..
"I've played against David de Gea and represented England alongside Tom Heaton; they are top-class keepers, and I am relishing the opportunity to compete alongside and support them as teammates.
"There is a lot that this group can achieve this season and I'm excited to play my part in helping everyone to reach these ambitions."
When asked about Butland's arrival, United boss Erik ten Hag told a news conference on Thursday: "Martin was recalled and we need three experienced goalkeepers.
"I'm really happy with David. It's quite clear he's our No. 1. He's a really good performer but there's always something that can happen with David as well and you have to be prepared for that so you don't have one."