Victor Valdes is delighted with his first season at Manchester United.
The former Barcelona goalkeeper penned an 18 month deal in January.
Asked about playing for the U21s, Valdes said: "This is something we do not do in Spain but I must accept it and I need to concentrate on my game because it's good to learn the pace of the play.
"I am very happy because my knee is responding well and I can play with my new teammates. It's a nice feeling to be back on the pitch to play football.
"This is the most important thing after the injury."