Gopichand also heaped praise on doubles pair of Chirag Shetty and Satwiksairaj Rankireddy who bagged the BWF Super 500 badminton tournament after they clinched the Thailand Open in August.
World No.6 Sindhu, who made early exits in China, Korea and Denmark, lost 13-21 21-18 19-21 to world No.42 Pai in a 74-minute women's singles match here.
Former world number one Srikanth was pitted against reigning two-time world championship and numero uno ranked Kento Momota of Japan in his opening round but he pulled out of the tournament.
The world number six Sindhu, who has been struggling of late, beat Li 21-15 21-13 in a match that last 44 minutes.
Despite bagging the World Championships title in August, Sindhu has been out-of-form as she has failed to cross the second round in three tournaments -- China Open, Korea Open and Denmark Open.
Indian shuttler PV Sindhu will be aiming to make a strong comeback in the French Open.
Fifth seed Sindhu, the Olympic silver medallist, lost 14-21 17-21 to the Korean in a 40-minute clash at the BWF World Tour Super 750 event.
Fifth seed Sindhu, who had made early exits in China and Korea, got back her bearing as she overcame former World Junior Champion Gregoria 22-20 21-18 in 38 minutes to keep her 5-0 record intact against the Indonesian.
After claiming the World title in August, Sindhu endured surprise first and second round exits at the China Open and Korea Open last month, respectively.
Ace shuttler PV Sindhu, who recently became the world champion, has insisted that a gold medal in Olympics 2020 in Tokyo remains her ultimate aim.
Indian badminton star PV Sindhu took the blessings of Durga Maa during the festivities and promised to return with laurels.
Indian shuttler PV Sindhu dropped to sixth position following poor outings in the China Open and Korea Open, but Parupalli Kashyap jumped to 25th position after the semifinal finish in Korea.
Beiwen Zhang scripted a comeback victory to knock PV Sindhu out of the Korea Open.
India's Korean badminton coach, Kim Ji Hyun, has confirmed her resignation due to personal reasons.
After the high of winning the World Championships, Olympic silver medallist Sindhu was knocked out of the China Open Super 1000 event by Thailand's Pornpawee Chochuwong in the second round last week.
PV Sindhu faced an unlikely defeat in the second round of the China Open, as she was defeated by Thailand's 15th seed Pornpawee Chochuwong.
PV Sindhu beat China's Xuerui Li 21-18, 21-12 in the first round of the China Open World Tour Super 1000.
PV Sindhu, who became India's first badminton World Champion, will return to action in the China Open on Tuesday.
PV Sindhu talked about her preparations for the Olympic qualifications, and revealed that she has kept an empty space in her cabinet for the coveted Olympic gold medal.
Sindhu said that the current situation of foreign coaches chipping in has helped players.
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