Norwich have confirmed that defender Ritchie de Laet has returned to Manchester United after his season-long loan deal was cancelled.
The 23-year-old Belgian has been hampered by a back injury, which limited his impact with the Canaries.
Lambert said: "Ritchie has gone back to Manchester United.
"We thank Sir Alex Ferguson for loaning him to us and wish Ritchie well for the future and hope he goes on to have a successful career at Manchester United."