Guerrero becomes United's sixth signing of the summer and joins on transfer deadline day.

"I am very proud to be part of the Manchester United family and look forward to achieving all our goals together," said Guerrero.

United manager Marc Skinner added: "Irene is a World Cup winner whose quality is an excellent addition to our team.

"The experience she brings, both domestically and internationally, will be key as we pursue success across the multiple competitions."