[6] On 28 February 2021, the parent company of the club Suning Holdings Group announced that operations were going to cease immediately due to financial difficulties.
[8] In his first season back he quickly established himself as a vital member of the team as the club gained promotion to the top tier at the end of the 2021 campaign.
[9] On 10 September 2024, Chinese Football Association announced that Gu was banned from football-related activities in China for life for involving in match-fixing.
[10][11][12] Gu was called up to the senior China squad for the 2018 FIFA World Cup qualification – AFC third round against South Korea and Iran.
[13] Gu made his debut for the China on 6 September 2016 in a 0-0 draw against Iran, coming on as a substitute for injury Zeng Cheng in the 12th minute.