The incident occurred in a minor collision with another aircraft on the ground at Shanghai's Pudong International Airport, according to previous reports.
"The aircraft had a clipped wing tip. A portion, possibly a metre (1.1 yard) of the wing tip, was torn," Malaysia Airlines CEO Ahmad Jauhari Yahya told reporters.
"It was repaired by Boeing and cleared by Boeing and was approved by various authorities. It was safe to fly."
Speculation has mounted over what happened to Malaysian Airlines flight 370, which vanished early Saturday en route from Kuala Lumpur to Beijing.
Its last known location was recorded over waters somewhere between Malaysia and southern Vietnam.
No debris has yet been found, but Vietnam and Malaysia have said oil slicks were spotted near where contact with the plane was lost.