Lee Zii Jia's sponsor Victor has issued an apology after the shuttler wore a jersey with the Malaysian flag upside down during his match against Chou Tien-chen at the World Tour Finals opening day (WTF) on Wednesday.

"We sincerely apologize to all Malaysian fans and Zii Jia for the error on Zii Jia's jersey during the WTF. This mistake does not reflect our deep respect for Malaysia, it's national symbols or the pride and honor of representing the nation on the international stage. We are conducting a thorough review of our processes to ensure that such errors do not occur in the future," said Victor via a statement.

The sports equipment company had earlier this week renewed their contract with Team LZJ until 2028.